Macro ecs

macro_rules! ecs {
    (
        $world:ident {
            $($name:ident: $type:ty => $mask:ident),* $(,)?
        }
        $resources:ident {
            $($(#[$attr:meta])*  $resource_name:ident: $resource_type:ty),* $(,)?
        }
    ) => { ... };
}