v0.2: Upgraded Interactions & Gameplay

This is a major update to the interactions in the game and the underlying code.  It runs better on Quest and also builds for PC, so I will be able to make a PC release.

Gameplay improvements:

• Pistols now have laser sights so you can see exactly where you are pointing
• Pistols, bananas, etc. are now grip-toggle - you don't have to squeeze the grip all the time
• Increased the size of the initial lobby area where players were triggering the first letter drop too soon
• Improved colliders on the desks so you can now shoot under them
• Sticky letter code and interactions improved:
  • they highlight when you're pointing at them
  • you can grab them from a distance - no more rooting around on the floor for that vowel!
• Added more spare letters for those harder-to-spell names!
• Added 3D-printable  models for a few more words you can make with the available letters
• Extended the "tag to exit" zone to the garbage can next to the paper cup (was too hard to shoot before)
• Added a Cancel button to back out if you tag a challenge by mistake and don't want to play that challenge

Other miscellaneous details:

• Clicking the left stick on Oculus controller switches to teleport mode - experimental! A bit broken.
  
• Added email and credits in-game
• Held items track much better than before
• Hand models stay active when holding guns/bananas/etc.
• Shoot the clock to stop it ticking (some players don't like it)
  
• Shoot the Boombox to stop or restart a random track

Behind the scenes I completely dropped the pre-release Unity XR Interactions Toolkit and switched to the VR Interaction Framework. It's much easier to work with, a lot of the small issues have been solved and it enabled me to extend the gameplay and remove things which were annoying or clunky before.

Future plans:

• Proper hand interactions, for example with the pistol trigger
• More question-and-answer sets
• Something interesting through those doors maybe