Macro ecs::aspect

macro_rules! aspect {
    {
            <$components:ty>
            all: [$($all_field:ident),*]
            none: [$($none_field:ident),*]
        } => { ... };
    {
            <$components:ty>
            all: [$($field:ident),*]
        } => { ... };
    {
            <$components:ty>
            none: [$($field:ident),*]
        } => { ... };
}