nonhuman changeling abilities, and blood centrifusion

[mqole]

Description

1. Non-humanoids can't open the changeling evolution menu UI (tried it with a monkey. didnt work!)
2. Currently, several species have blood that does not get processed by centrifuge: moth, vox, grey, snail. because this blood is not processed it will not explode in the centrifuge, reducing the centrifuge's reliability in ling rounds

Additional context
when using admin commands to give someone ling objectives, it seems to be hit or miss whether they actually get the changeling variable? ive had to go into the variable edits and add it manually a LOT