Alpha 1.4

OpenXR compatibility and colours

• Integrates Anakins' swapchain-format and HUD texture-import fix for runtimes
  that offer an sRGB swapchain instead of the requested UNORM format.
• Corrects eye and HUD colour transfer when the runtime requires sRGB,
  addressing the darker, oversaturated image. The existing UNORM path is preserved.
• Retains the current OpenXR start-up and recovery behaviour.

USA support

• Both the VR and FPS graphic packs now support USA v1 as well as European v0.
• Supported modules: European D2308838 and USA BBAF1908. The code, data and
  relocation layouts were compared before enabling the USA module.

First-person movement

• Left-stick movement follows your horizontal head direction combined with
  right-stick turning. Light smoothing softens small heading changes without
  changing movement speed. Looking up/down and head tilt do not steer movement.
• Enabled automatically in first-person gameplay with a gamepad or VR
  controllers. Diorama, world-map and menu movement retain their existing behaviour.

Visibility and transitions

• Hides distant pipes and route details that appeared above the World 1 map.
• Separates the bonus-world map planes and filters associated foreign models
  and particle effects while retaining neighbouring areas on the current plane.
• Hides the detached room beside World 2 and during pipe travel from World 1;
  retains it when entering its own area.
• Corrects visibility of the remote bonus room in the first level, preventing
  it from being brought into view solely by the expanded VR visibility test.
• Removes the distracting cyan screen flare in the first level.
• Moves title confirmation and file-selection transitions onto the complete
  menu canvas so the iris effect is presented with its scene.

All three camera modes, VR-controller bindings, the D-pad gesture, selectable
mode-switch button, stereo-lighting corrections and FPS options are retained.

See CREDITS.md for contributions and
KNOWN-ISSUES.md for current limitations.