AR and VR scripting improvements.

[Blitzy]

:rocket: Improvements

• Added the os.arSupported() and os.vrSupported() functions to query device support for AR and VR respectively. Both of these are promises and must be awaited.

  const arSupported = await os.arSupported();
  if (arSupported) {
      //...
  }
  
  const vrSupported = await os.vrSupported();
  if (vrSupported) {
      //...
  }

• Added shouts for entering and exiting AR and VR:

  • @onEnterAR - Called when AR has been enabled.
  • @onExitAR - Called when AR has been disabled.
  • @onEnterVR - Called when VR has been enabled.
  • @onExitVR - Called when VR has been disabled.