Beta Branch: Beat Saber Updated Unity Version

Hey players,
Beta Branch of Beat Saber on the updated Unity version is available now. Please continue sharing your feedback in case you encounter any issues. Note: This update doesn't include any new music or feature content.

Changes:

• Updated Unity version to 2021 LTS.
  
• OpenXR is now used XR runtime on Steam
  

Known Issues (Steam):

• Reset orientation button may not work
  
• Changing refresh rate in SteamVR overlay during gameplay may result in black screen
  
• Controllers may remain visible when accessing system menu in SteamVR overlay