Minor improvements for xenos, in order of importance.

1. Facehugger inhands for xenos and the odd case where a human can pick it up. Sprites are available.
2. Letting weeds heal all forms of damage, clone and brain included.
3. Moving hunter invisbility stalking to sentinels.
4. Different colored hivemind chat, possibly purple.
5. Queen gets larger, bolded letters in hivemind chat, possibly with a red name.
6. Examining xenos for injuries like "it has severe bruisings!" as well as examining for inhands "it has an alien in its left hand".
7. Letting xenos melt or dig through mineral walls without it resulting in a space tile.
8. Giving xenos actual acid blood and (optionally) the ability to bleed out. We have the exotic_blood var for this now.
9. Me emotes for xenos. ERP is banned so this can't possibly go wrong :)
10. Making it so being eaten by a xeno won't destroy your body when you die.
11. Being able to perform chest surgery on xenos to retrieve a corpse from them. Perhaps expand this to humans eating monkeys, and expanding reverse-chest bursting scenarios.




Bugfixes or functional changes for xenos, in order of importance.

1. https://github.com/tgstation/-tg-station/issues/8321 is making attacking the AI sat impossible.
3. https://github.com/tgstation/-tg-station/issues/7849 you can't edit alien icons, this makes me very sad. Has to do with pouncing sprites.
3. Removing the stalk intent's sprite. We can keep the intent of walking, but the sprite has got to go. Aliens cannot wear clothing anyway and the fake xeno in the group does not happen enough to be worth the trouble it brings.