Automatically determine if a player's skin is slim ("ALEX") or classic ("STEVE")

[Raymond-exe]

Could use mojang API, see UUID -> Profile + Skin/Cape (wiki.vg) (includes whether or not a player's skin is slim).

Might also be useful to pull the skin from there instead of crafatar (as we do right now), although it would limit player info retrieval to once per player per minute.

[jomo]

This should do:

import java.util.UUID;

public boolean isSlim(String uuid) {
  return (UUID.fromString(uuid).hashCode() & 1) != 0;
}