[XR] Update to 2018.3.0b12

Updates manifest and project version tag. Also adds a new VFXManager.asset.

Packages/manifest.json

 {
-    "dependencies": {
-      "com.unity.xr.arcore": "1.0.0-preview.23",
-      "com.unity.xr.arfoundation": "1.0.0-preview.20",
-      "com.unity.xr.arkit": "1.0.0-preview.17"
-    }
-  }
+  "dependencies": {
+    "com.unity.ads": "2.0.8",
+    "com.unity.analytics": "3.2.2",
+    "com.unity.collab-proxy": "1.2.11",
+    "com.unity.package-manager-ui": "2.0.3",
+    "com.unity.purchasing": "2.0.1",
+    "com.unity.textmeshpro": "1.3.0",
+    "com.unity.xr.arcore": "1.0.0-preview.23",
+    "com.unity.xr.arfoundation": "1.0.0-preview.20",
+    "com.unity.xr.arkit": "1.0.0-preview.17",
+    "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"
+  }
+}

ProjectSettings/ProjectVersion.txt

-m_EditorVersion: 2018.1.1f1
+m_EditorVersion: 2018.3.0b12

ProjectSettings/VFXManager.asset

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