Updated settings for XRSDK

[RogPodge]

updated some project settings to account for the new XRSDK support in mainline MRTK

[provencher]

Thanks for the PR Roger.

My preference for the time being is to avoid overtly migrating this project to place a hard dependency on XR SDK, and instead add some logic in the MRTK Config that make the necessary changes at runtime to support XRSDK, according to the project settings the code is loaded up in.

As far as a I know, the only change needed for support within the MRTK-Quest Core unitypackage, is to add a TrackedPoseDriver component to the main camera.

In fact, MRTK-Quest uses the main camera already in the scene by default, and simply reparents it into the Oculus Rig at runtime.