Macro world

macro_rules! world {
    (
        $world:ident {
            components {
                $($name:ident: $type:ty => $mask:ident),* $(,)?
            }$(,)?
            $resources:ident {
                $($resource_name:ident: $resource_type:ty),* $(,)?
            }
        }
    ) => { ... };
}