Derive Macro thalo_derive::Command

#[derive(Command)]

Used to implement traits for an aggregate command enum.

A command enum can either wrap nested command structs which each implement Handle, or contain the data embedded without nested command structs.

Depeneding on this, the implementation for thalo::Handle<...> for thalo::State<T> will be slightly different. However, the implementation should not concern developers, as this is only used internally by the thalo::export_aggregate! macro.

If the command uses nested command structs, then a From implementation will be generated for each variant.