Crate wings_macro

Defines macros for declaring traits and systems in wings.

Macros

• crate_version
  Creates a wings_marshal::Version object describing the current version of this crate.
• instantiate_systems
  Instructs the host to instantiate systems (and all of their dependencies) when creating the given system group.

Attribute Macros

• export_system
  Exports the provided system, allowing wings to instantiate it and other systems to access it.
• export_type
  Exports the provided type, allowing it to be used as an event or system type.
• system_trait
  Marks this trait as an interface through which plugins can access a system.