Make it easier for both thralls and vampires to recognize eachother

[RGBDeadSilent]

Hell double up on this PR, add a Hivemind Icon to limbcritters and their host changeling too. Go full teamwork, i'd love it. I've sent out Handspiders to go collect DNA, did a lap around the station and come back and a handspider runs out and bites me. "MASTER MASTER I HAVE DNA FOR YOU." Bruh you just bit me you big dummy, didn't even change identities, its like object permanence. I left line of sight so I stopped existing.