Rust upgrade task list

[zmerp]

Current MSRV: 1.77

Useful adoptable features:

• 1.78: None
• 1.79:
  • [ ] Use of references escaping if or match blocks
• 1.80:
  • [ ] Lazy -> LazyLock
  • [ ] LazyCell for thread local (GraphicsContext)
  • [ ] Duration::div_duration_f32
• 1.81:
  • [ ] #[expect(lint)]
• 1.82:
  • [ ] Use &raw const/mut var instead of cast