Registering Rust symbols

[Bromeon]

A chapter about #[derive(GodotClass)] and everything around it, that goes through options step by step.

• Registerable symbols
  • Classes
  • Methods
  • Overriding virtual methods
  • Properties (var + export)
  • Signals, constants
• Customization
  • Conversions (ToGodot, FromGodot)
  • Enums
  • Variant type, meta, advanced export flags, ...