Generate extras for variants (take 2?)

[gegoune]

Hi! #12 (a4954c9) added generated extras for variants, such as dim and bright for light and stark and warm for dark. Those no longer seem to be generated. Did you decide against it at some point or was it just lost at some point? If the latter, is there a chance to get those back?

[mcchrish]

I'm open to having it back. I don't remember exactly why it was remove before to be honest 😅. It was gone when the generator was moved to shipwright.