Derive Macro parce_macros::RemoveLexerAttributes

#[derive(RemoveLexerAttributes)]
{
    // Attributes available to this derive:
    #[skip]
    #[frag]
    #[set_mode]
    #[mode]
    #[modes]
}

No-op derive macro that declares the helper attributes used by the primary lexer macro.

Its a little hacky, I know, but its simpler than manually removing all of these attributes in the main macro.