MRTK-Quest port of Microsoft Surfaces - Load Screen Improvements

Load screen improvements for MRDL Surfaces experiment.

• Added head-tracked OVR Overlay that masks jitter that occurs when scenes load

MRTK-Quest port of Microsoft Surfaces app

First functional version of Microsoft Surfaces app for Oculus Quest.

Bugs:

• Load transition does not use Oculus overlay, so it glitches out
• Some scenes have low performance

Note if you share this app or make videos over twitter, please give a shoutout to Lars and myself.