Merge pull request #82 from unity/4.0-manifest-cleanup

[4.0] Removed Unnecessary Packages From AR Foundation Samples

Packages/manifest.json

 {
   "dependencies": {
-    "com.unity.2d.sprite": "1.0.0",
-    "com.unity.2d.tilemap": "1.0.0",
-    "com.unity.analytics": "3.3.5",
-    "com.unity.collab-proxy": "1.3.9",
-    "com.unity.ext.nunit": "1.0.0",
-    "com.unity.purchasing": "2.1.1",
-    "com.unity.test-framework": "1.1.18",
-    "com.unity.textmeshpro": "3.0.1",
     "com.unity.ugui": "1.0.0",
     "com.unity.xr.arcore": "4.0.8",
     "com.unity.xr.arfoundation": "4.0.8",