Update tanks to work again.

.gitignore

 # Unity3D Generated File On Crash Reports
 /com.unity.ml-agents/sysinfo.txt
 
+*/UserSettings/
+
 # Builds
 *.apk
 *.unitypackage

ML-Agents-Input-Example/Assets/Samples/Input System/1.0.2/Tanks Demo/Prefabs/Tank.prefab

     VectorActionDescriptions: []
     VectorActionSpaceType: 0
     hasUpgradedBrainParametersWithActionSpec: 1
-  m_Model: {fileID: 0}
+  m_Model: {fileID: 5022602860645237092, guid: 5cee4ff9633744c7ba9d151aab2d0500, type: 3}
   m_InferenceDevice: 0
   m_BehaviorType: 0
   m_BehaviorName: Tanks
   GridNumSideZ: 40
   CellScaleY: 0.01
   RotateToAgent: 1
-  ChannelDepth: 04000000
+  ChannelDepth: 03000000
-  - terrain
-    m_Bits: 1792
+    m_Bits: 1280
   gridDepthType: 1
   rootReference: {fileID: 2855894493477824887}
   MaxColliderBufferSize: 500
   - {r: 0, g: 1, b: 0.022001743, a: 0}
   - {r: 1, g: 0, b: 0.75294113, a: 0}
   GizmoYOffset: 6
-  ShowGizmos: 1
+  ShowGizmos: 0
   CompressionType: 1
 --- !u!114 &1740605957079586335
 MonoBehaviour:

ML-Agents-Input-Example/Assets/Samples/Input System/1.0.2/Tanks Demo/Scenes/Tanks_Training.unity

       propertyPath: tanks.Array.size
       value: 2
       objectReference: {fileID: 0}
+    - target: {fileID: 4811314458562839759, guid: eeb939637a08c4d79851400b17822966,
+        type: 3}
+      propertyPath: tanks.Array.data[0].isHeuristic
+      value: 0
+      objectReference: {fileID: 0}
     - target: {fileID: 4811314459191862654, guid: eeb939637a08c4d79851400b17822966,
         type: 3}
       propertyPath: m_LocalPosition.z

ML-Agents-Input-Example/Packages/manifest.json

     "com.unity.test-framework": "1.1.22",
     "com.unity.textmeshpro": "2.1.1",
     "com.unity.timeline": "1.2.18",
+    "com.unity.toolchain.macos-x86_64-linux-x86_64": "0.1.20-preview",
     "com.unity.ugui": "1.0.0",
     "com.unity.modules.ai": "1.0.0",
     "com.unity.modules.androidjni": "1.0.0",

ML-Agents-Input-Example/Packages/packages-lock.json

         "com.unity.burst": "1.4.6"
       }
     },
+    "com.unity.sysroot": {
+      "version": "0.1.19-preview",
+      "depth": 1,
+      "source": "registry",
+      "dependencies": {},
+      "url": "https://packages.unity.com"
+    },
+    "com.unity.sysroot.linux-x86_64": {
+      "version": "0.1.14-preview",
+      "depth": 1,
+      "source": "registry",
+      "dependencies": {
+        "com.unity.sysroot": "0.1.18-preview"
+      },
+      "url": "https://packages.unity.com"
+    },
     "com.unity.test-framework": {
       "version": "1.1.22",
       "depth": 0,
         "com.unity.modules.animation": "1.0.0",
         "com.unity.modules.audio": "1.0.0",
         "com.unity.modules.particlesystem": "1.0.0"
+      },
+      "url": "https://packages.unity.com"
+    },
+    "com.unity.toolchain.macos-x86_64-linux-x86_64": {
+      "version": "0.1.20-preview",
+      "depth": 0,
+      "source": "registry",
+      "dependencies": {
+        "com.unity.sysroot": "0.1.19-preview",
+        "com.unity.sysroot.linux-x86_64": "0.1.14-preview"
       },
       "url": "https://packages.unity.com"
     },