Bevy 0.20

Bevy 0.20 has been released with major updates including significant improvements to its Solari pathtraced renderer (now faster and macOS-compatible), new UI widgets for the Feathers toolkit, adoption of the WESL shader language, and support for custom sprite materials and 2D extended materials. The release represents contributions from 227 developers across 817 pull requests and introduces numerous quality-of-life improvements and new features for the open-source Rust game engine.