Fix app for build 7 update; added UI support for adjusting grid size

- Build 7 update broke the controllers because I did not include the "android.hardware.vr.headtracking" uses-feature in the manifest. Because of this, the headset was incorrectly registered as an Oculus Go. Looks like they started to enforce this setting in the latest update.
- Added support for adjusting the grid size in the settings panel.

ProjectSettings/EditorBuildSettings.asset

@@ -5,58 +5,7 @@ EditorBuildSettings:
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   serializedVersion: 2
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-    guid: 24872d3c3760f23498f41ecb019ea5cd
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-    path: Assets/Oculus/SampleFramework/Usage/AvatarGrab.unity
-    guid: 941c413af7c367d40aab0725f5a59530
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-    path: Assets/Oculus/SampleFramework/Usage/CustomControllers.unity
-    guid: e0f49aa4174f98941b88699b5fecddc0
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-    path: Assets/Oculus/SampleFramework/Usage/CustomHands.unity
-    guid: a4f984fcee593d2418cc61f4a993d46d
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-    path: Assets/Oculus/SampleFramework/Usage/DebugUI.unity
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-  - enabled: 0
-    path: Assets/Oculus/SampleFramework/Usage/Locomotion.unity
-    guid: 024cd9dcd49bd8f46a6bea03aa8a21bb
   - enabled: 1
     path: Assets/Scenes/QuestAppLauncher.unity
     guid: dca0720aceedefc46b483f0277b30d6a
-  - enabled: 0
-    path: Assets/Oculus/SampleFramework/Usage/Stereo180Video.unity
-    guid: 11cf8fa7bf3deb04db11bd170c0b4338
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