Add's more stuff for Xenobiology and slimes

Adds some more options for xenobiologists and slightly reduces the RNG needed for getting slimes.

* When plasma is injected in a slime it will increase it's mutation chance by 5% per 5 units of plasma(To a max of 50%)
* When Inaprovaline is injected it decreases mutation chance by 5% per 5 units(All the way to 0%)
* When slimes are fed solid plasma they will become friendly with you.
* Injecting a grey slime with water will make inaprovaline(5:3 Ratio)
No feedback at all?
Maybe add a message "blabla you fed slime plasma, he is now happy and is your friend" or something
Fluff is important, please dont disregard fluff