Bump the official supported Unity version to 18.4. Fixes MLA-23 (#3121)

.gitignore

 /UnitySDK/[Ll]ibrary/
+/UnitySDK/Logs/
-/UnitySDK/[Pp]ackages/
 /UnitySDK/Assets/AssetStoreTools*
 /UnitySDK/Assets/Plugins*
 /UnitySDK/Assets/Demonstrations*

.yamato/csharp-tests.yml

 test_editors:
-  - version: 2017.4
   - version: 2018.4
   - version: 2019.3
 ---
   agent:
     type: Unity::VM::osx
-    image: ml-agents/ml-agents-bokken-mac:v0.1.2-440635
+    image: ml-agents/ml-agents-bokken-mac:v0.1.3-475350
     flavor: i1.small
   variables:
     UNITY_VERSION: {{ editor.version }}
     pull_requests:
       - targets:
           only:
-            - "develop"
             - "master"
             - "/release-.*/"
             - "/hotfix-.*/"

.yamato/standalone-build-test.yml

 test_editors:
-  - version: 2017.4
   - version: 2018.4
   - version: 2019.3
 ---
   agent:
     type: Unity::VM::osx
-    image: ml-agents/ml-agents-bokken-mac:v0.1.2-440635
+    image: ml-agents/ml-agents-bokken-mac:v0.1.3-475350
     flavor: i1.small
   variables:
     UNITY_VERSION: {{ editor.version }}
     pull_requests:
       - targets:
           only:
-            - "develop"
             - "master"
             - "/release-.*/"
             - "/hotfix-.*/"

UnitySDK/Assets/ML-Agents/Editor/Tests/StandaloneBuildTest.cs

 {
     public class StandaloneBuildTest
     {
-        static void BuildStandalonePlayerOSX()
+        public static void BuildStandalonePlayerOSX()
         {
             string[] scenes = { "Assets/ML-Agents/Examples/3DBall/Scenes/3DBall.unity" };
             var buildResult = BuildPipeline.BuildPlayer(scenes, "testPlayer", BuildTarget.StandaloneOSX, BuildOptions.None);

UnitySDK/Assets/ML-Agents/Examples/3DBall/TFModels/3DBall.nn.meta

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   userData: 
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UnitySDK/Assets/ML-Agents/Examples/3DBall/TFModels/3DBallHard.nn.meta

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UnitySDK/Assets/ML-Agents/Examples/Basic/TFModels/Basic.nn.meta

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UnitySDK/Assets/ML-Agents/Examples/Bouncer/TFModels/Bouncer.nn.meta

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UnitySDK/Assets/ML-Agents/Examples/Crawler/TFModels/CrawlerDynamic.nn.meta

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UnitySDK/Assets/ML-Agents/Examples/FoodCollector/TFModels/FoodCollector.nn.meta

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   userData: 
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UnitySDK/Assets/ML-Agents/Examples/GridWorld/TFModels/GridWorld.nn.meta

 fileFormatVersion: 2
 guid: a812f1ce7763a4a0c912717f3594fe20
 ScriptedImporter:
+  fileIDToRecycleName:
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UnitySDK/Assets/ML-Agents/Examples/Hallway/TFModels/Hallway.nn.meta

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   userData: 
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UnitySDK/Assets/ML-Agents/Examples/PushBlock/TFModels/PushBlock.nn.meta

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+  externalObjects: {}
   userData: 
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UnitySDK/Assets/ML-Agents/Examples/Pyramids/TFModels/Pyramids.nn.meta

 fileFormatVersion: 2
 guid: aa3fa19a09ec44a41be3da037783ad41
 ScriptedImporter:
+  fileIDToRecycleName:
+    11400000: main obj
+  externalObjects: {}
   userData: 
   assetBundleName: 
   assetBundleVariant: 

UnitySDK/Assets/ML-Agents/Examples/Reacher/TFModels/Reacher.nn.meta

 fileFormatVersion: 2
 guid: d7bdb6a78154f4cf99437d67e4a569a8
 ScriptedImporter:
+  fileIDToRecycleName:
+    11400000: main obj
+  externalObjects: {}
   userData: 
   assetBundleName: 
   assetBundleVariant: 

UnitySDK/Assets/ML-Agents/Examples/SharedAssets/Materials/Textures/LogoCube.png.meta

 TextureImporter:
   fileIDToRecycleName: {}
   externalObjects: {}
-  serializedVersion: 4
+  serializedVersion: 9
   mipmaps:
     mipMapMode: 0
     enableMipMap: 0
     heightScale: 0.25
     normalMapFilter: 0
   isReadable: 0
+  streamingMipmaps: 0
+  streamingMipmapsPriority: 0
   grayScaleToAlpha: 0
   generateCubemap: 6
   cubemapConvolution: 0
     serializedVersion: 2
     filterMode: 1
     aniso: -1
-    mipBias: -1
+    mipBias: -100
     wrapU: 1
     wrapV: 1
     wrapW: -1
   spriteTessellationDetail: -1
   textureType: 8
   textureShape: 1
+  singleChannelComponent: 0
-  - buildTarget: DefaultTexturePlatform
+  - serializedVersion: 2
+    buildTarget: DefaultTexturePlatform
     maxTextureSize: 2048
     resizeAlgorithm: 1
     textureFormat: -1
     allowsAlphaSplitting: 0
     overridden: 0
     androidETC2FallbackOverride: 0
-  - buildTarget: Standalone
+  - serializedVersion: 2
+    buildTarget: Standalone
     maxTextureSize: 2048
     resizeAlgorithm: 1
     textureFormat: -1
     allowsAlphaSplitting: 0
     overridden: 0
     androidETC2FallbackOverride: 0
-  - buildTarget: iPhone
+  - serializedVersion: 2
+    buildTarget: iPhone
     maxTextureSize: 2048
     resizeAlgorithm: 1
     textureFormat: -1
     allowsAlphaSplitting: 0
     overridden: 0
     androidETC2FallbackOverride: 0
-  - buildTarget: Android
+  - serializedVersion: 2
+    buildTarget: Android
     maxTextureSize: 2048
     resizeAlgorithm: 1
     textureFormat: -1
     sprites: []
     outline: []
     physicsShape: []
+    bones: []
+    spriteID: a3ff174ca5d764281aae23e2c354baca
+    vertices: []
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+    weights: []
+  pSDRemoveMatte: 0
+  pSDShowRemoveMatteOption: 0
   userData: 
   assetBundleName: 
   assetBundleVariant: 

UnitySDK/Assets/ML-Agents/Examples/SharedAssets/Materials/Textures/UnityLogo.png.meta

 TextureImporter:
   fileIDToRecycleName: {}
   externalObjects: {}
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+  serializedVersion: 9
   mipmaps:
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     enableMipMap: 0
     heightScale: 0.25
     normalMapFilter: 0
   isReadable: 0
+  streamingMipmaps: 0
+  streamingMipmapsPriority: 0
   grayScaleToAlpha: 0
   generateCubemap: 6
   cubemapConvolution: 0
     serializedVersion: 2
     filterMode: -1
     aniso: -1
-    mipBias: -1
+    mipBias: -100
     wrapU: 1
     wrapV: 1
     wrapW: -1
   spriteTessellationDetail: -1
   textureType: 8
   textureShape: 1
+  singleChannelComponent: 0
-  - buildTarget: DefaultTexturePlatform
+  - serializedVersion: 2
+    buildTarget: DefaultTexturePlatform
     maxTextureSize: 2048
     resizeAlgorithm: 0
     textureFormat: -1
     allowsAlphaSplitting: 0
     overridden: 0
     androidETC2FallbackOverride: 0
-  - buildTarget: Standalone
+  - serializedVersion: 2
+    buildTarget: Standalone
     maxTextureSize: 2048
     resizeAlgorithm: 0
     textureFormat: -1
     allowsAlphaSplitting: 0
     overridden: 0
     androidETC2FallbackOverride: 0
-  - buildTarget: iPhone
+  - serializedVersion: 2
+    buildTarget: iPhone
     maxTextureSize: 2048
     resizeAlgorithm: 0
     textureFormat: -1
     allowsAlphaSplitting: 0
     overridden: 0
     androidETC2FallbackOverride: 0
-  - buildTarget: Android
+  - serializedVersion: 2
+    buildTarget: Android
     maxTextureSize: 2048
     resizeAlgorithm: 0
     textureFormat: -1
     sprites: []
     outline: []
     physicsShape: []
+    bones: []
+    spriteID: b33f877521c6d4d8782f018141dc1d6a
+    vertices: []
+    indices: 
+    edges: []
+    weights: []
+  pSDRemoveMatte: 0
+  pSDShowRemoveMatteOption: 0
   userData: 
   assetBundleName: 
   assetBundleVariant: 

UnitySDK/Assets/ML-Agents/Examples/Tennis/TFModels/Tennis.nn.meta

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+  fileIDToRecycleName:
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UnitySDK/Assets/ML-Agents/Examples/Walker/TFModels/Walker.nn.meta

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UnitySDK/Assets/ML-Agents/Examples/WallJump/TFModels/BigWallJump.nn.meta

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UnitySDK/ProjectSettings/ProjectVersion.txt

-m_EditorVersion: 2017.4.33f1
+m_EditorVersion: 2018.4.14f1

docs/Installation.md

 install Python with additional dependencies. Each of the subsections below
 overviews each step, in addition to a Docker set-up.
 
-## Install **Unity 2017.4** or Later
+## Install **Unity 2018.4** or Later
 
 [Download](https://store.unity.com/download) and install Unity. If you would
 like to use our Docker set-up (introduced later), make sure to select the _Linux
 
 If you intend to copy the `UnitySDK` folder in to your project, ensure that
 you have the [Barracuda preview package](https://docs.unity3d.com/Packages/com.unity.barracuda@0.3/manual/index.html) installed.
-
-To install the Barracuda package in Unity **2017.4.x**, you will have to copy the
-`UnityPackageManager` folder under the `UnitySDK` folder to the root directory of your
-project.
 
 To install the Barrcuda package in later versions of Unity, navigate to the Package
 Manager window by navigating to the menu `Window` -> `Package Manager`.  Click on the

docs/Migrating.md

 * Offline Behavioral Cloning has been removed. To learn from demonstrations, use the GAIL and
 Behavioral Cloning features with either PPO or SAC. See [Imitation Learning](Training-Imitation-Learning.md) for more information.
 * `mlagents.envs` was renamed to `mlagents_envs`. The previous repo layout depended on [PEP420](https://www.python.org/dev/peps/pep-0420/), which caused problems with some of our tooling such as mypy and pylint.
+* The official version of Unity ML-Agents supports is now 2018.4 LTS.  If you run into issues, please consider deleting your library folder and reponening your projects.  You will need to install the Barracuda package into your project in order to ML-Agents to compile correctly.
 
 ### Steps to Migrate
  * If you had a custom `Training Configuration` in the Academy inspector, you will need to pass your custom configuration at every training run using the new command line arguments `--width`, `--height`, `--quality-level`, `--time-scale` and `--target-frame-rate`.

docs/localized/KR/docs/Installation.md

 Clone(복제)하고 추가종속성을 가지는 Python(파이썬)을 설치해야합니다. 아래 Subsection(하위섹션)에서는 Docker(도커) 설정 외에도
 각 단계를 개괄적으로 설명합니다.
 
-## **Unity 2017.4** 또는 이후의 버전을 설치하십시오.
+## **Unity 2018.4** 또는 이후의 버전을 설치하십시오.
 
 [다운로드](https://store.unity.com/kr/download)하고 설치하십시오. 만약 저희의 도커 설정(차후에 소개할)을 사용하고 싶다면,
 유니티를 설치할 때, Linux Build Support를 설정하십시오.
 
 ## 한글 번역
 
-해당 문서의 한글 번역은 [장현준 (Hyeonjun Jang)]([https://github.com/janghyeonjun](https://github.com/janghyeonjun))에 의해 진행되었습니다. 내용상 오류나 오탈자가 있는 경우 totok682@naver.com 으로 연락주시면 감사드리겠습니다.
+해당 문서의 한글 번역은 [장현준 (Hyeonjun Jang)]([https://github.com/janghyeonjun](https://github.com/janghyeonjun))에 의해 진행되었습니다. 내용상 오류나 오탈자가 있는 경우 totok682@naver.com 으로 연락주시면 감사드리겠습니다.

run-tests-editmode-osx-editor.sh

 
     echo "Starting tests via $UNITY"
 
-    CMD_LINE="$UNITY -runTests -logfile - -projectPath $BASETPATH/UnitySDK -testResults $BASETPATH/results.xml -testPlatform editmode"
+    CMD_LINE="$UNITY -batchmode -runTests -logfile - -projectPath $BASETPATH/UnitySDK -testResults $BASETPATH/results.xml -testPlatform editmode"
 
     echo "$CMD_LINE ..."
 

UnitySDK/ProjectSettings/VFXManager.asset

+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!937362698 &1
+VFXManager:
+  m_ObjectHideFlags: 0
+  m_IndirectShader: {fileID: 0}
+  m_CopyBufferShader: {fileID: 0}
+  m_SortShader: {fileID: 0}
+  m_RenderPipeSettingsPath: 
+  m_FixedTimeStep: 0.016666668
+  m_MaxDeltaTime: 0.05

UnitySDK/Packages/manifest.json

+{
+  "dependencies": {
+    "com.unity.ads": "2.0.8",
+    "com.unity.analytics": "3.2.2",
+    "com.unity.collab-proxy": "1.2.15",
+    "com.unity.package-manager-ui": "2.0.8",
+    "com.unity.purchasing": "2.0.3",
+    "com.unity.textmeshpro": "1.4.1",
+    "com.unity.modules.ai": "1.0.0",
+    "com.unity.modules.animation": "1.0.0",
+    "com.unity.modules.assetbundle": "1.0.0",
+    "com.unity.modules.audio": "1.0.0",
+    "com.unity.modules.cloth": "1.0.0",
+    "com.unity.modules.director": "1.0.0",
+    "com.unity.modules.imageconversion": "1.0.0",
+    "com.unity.modules.imgui": "1.0.0",
+    "com.unity.modules.jsonserialize": "1.0.0",
+    "com.unity.modules.particlesystem": "1.0.0",
+    "com.unity.modules.physics": "1.0.0",
+    "com.unity.modules.physics2d": "1.0.0",
+    "com.unity.modules.screencapture": "1.0.0",
+    "com.unity.modules.terrain": "1.0.0",
+    "com.unity.modules.terrainphysics": "1.0.0",
+    "com.unity.modules.tilemap": "1.0.0",
+    "com.unity.modules.ui": "1.0.0",
+    "com.unity.modules.uielements": "1.0.0",
+    "com.unity.modules.umbra": "1.0.0",
+    "com.unity.modules.unityanalytics": "1.0.0",
+    "com.unity.modules.unitywebrequest": "1.0.0",
+    "com.unity.modules.unitywebrequestassetbundle": "1.0.0",
+    "com.unity.modules.unitywebrequestaudio": "1.0.0",
+    "com.unity.modules.unitywebrequesttexture": "1.0.0",
+    "com.unity.modules.unitywebrequestwww": "1.0.0",
+    "com.unity.modules.vehicles": "1.0.0",
+    "com.unity.modules.video": "1.0.0",
+    "com.unity.modules.vr": "1.0.0",
+    "com.unity.modules.wind": "1.0.0",
+    "com.unity.modules.xr": "1.0.0",
+    "com.unity.barracuda": "0.3.2-preview"
+  }
+}