This commit add a new target platform to hashlink : Xbox Series (console), aka Scarlett. Defined with macro `HL_XBS`.
It does not contain Xbox specific features, except for some adaptation in DirectX12, but will allow the use of hashlink (instead of hashlink C) on the target platform.

Use with `-lib heaps`, add `-lib directx -D dx12 -D usesys` and definitions of `haxe.AudioTypes`, `haxe.GameController`, `haxe.System`.

- Tested on game with GDK version 230303, where 2D display are ok with Heaps.io
- Known issues:
  - Support only 1920x1080 resolution + 60 FPS, but not yet 2k / 4k / 120 FPS.
  - The `dx12.getRequiredIntermediateSize` return size+offset for HL_XBS, which is a tmp fix for `dx12.updateSubResource` error when `first != 0`

…figuration