Macro impl_ranged

macro_rules! impl_ranged {
    ($(
        $type:ident {
            mod_name: $mod_name:ident
            internal: $internal:ident
            signed: $is_signed:ident
            unsigned: $unsigned_type:ident
            optional: $optional_type:ident
            $(manual: [$($skips:ident)+])?
        }
    )*) => { ... };
}

Implement a ranged integer type.