Full-range skin color for Blattodeans (and maybe everyone?)

[mintyphresh]

Spoke with a dev about implementing the Forums feature-- Mordent brought up concerns about intrusivity with players that don't want to sign up to the forums for privacy reasons. Additionally, there's probably going to be some difficulty with getting some kind of forum-ckey linkage going (and I don't think there's a soul alive that would want to grant the medal manually for every person with a forum account).

I've made a PR that adds the feature to Blattodeans (#17736), but the future of odd-colored skin on humans is uncertain.