• Metal: Shaders now use half floating-point arithmetic when possible for improved performance. [⚠️ Recompile Materials]
• engine: add support for presentation time in Renderer
• engine: added guard bands support for screen-space effects
• gltfio: Add multi-scene support.
• gltfio: Various glTF-related cleanup and enhancements.
• gltfio: Add support for KHR_texture_basisu.