Lock all Tree mutations behind infusions

[RelentlessGarbage]

this post complaints a bout a bunch of things in a lot of places but i think i've sussed the problem. there's no fancy behaviour specifically affecting trees, it's just tree mutations are quite plentiful so they stack the HYPnewmutationcheck proc (which is called when a plant would normally be able to mutate)

tbh i think HYPnewmutationcheck is the issue. should probably be the same % for all plants to mutate, like 5%, whereby it then rolls from all available mutations (with weighting based on how common the new strain should be)

Makes sense as to why I see trees mutating so often, then. Doing that would probably fix trees mutating excessively, and probably make infusions the go-to method for getting a specific kind of mutant tree - since, with 4 possible mutation choices, getting a mutation via brute-force replanting shenanigans or unstable mutagen would be an exercise in frustration. In light of that, a specific infusion for sassafras trees would be ideal, though it doesn't have to be Cola if people don't think that's a good choice of reagent.

(I will continue to harp on Dogwood trees, though. No offense to the creator, but they are quite irritating to have around.)