ScummVR: ScummVM with Meta Quest VR support

Fork of ScummVM (github.com/scummvm/scummvm) adding virtual cinema
mode for Meta Quest 2/3/Pro headsets.

Play classic adventure games on a floating screen in VR with Quest
controller support for pointing and clicking.

Features:
- OpenXR stereo rendering at native Quest resolution
- Virtual cinema screen (3.2m x 1.8m) with head tracking
- Controller input: aim=cursor, trigger=click, grip=right-click, B=ESC
- Full audio with Vorbis speech support
- Tested with Day of the Tentacle on Meta Quest 2

See README-ScummVR.md for install and build instructions.

Based on ScummVM commit c62dd11cbbb.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>