[NONMODULAR] Kills Is_Color_Dark

[CliffracerX]

About The Pull Request

Quietly takes the snowflake function is_color_dark out back and sends it out to pasture to join the rest of the bad TG decisions we've nuked.

Why It's Good For The Game

Now Juni can play a literal shadow, or anyone can DIY a useless flashdark.

Changelog

:cl: del: mutant color darkness lock & a couple other dark checks /:cl:

[CliffracerX]

@Nerev4r humbly requesting review and merge on this