Bark (inherit upgrades & fix missability)

[Kamejeir]

Summary

None

Purpose of change

Getting shifting bark, then camouflage skin, getting certain addons (Leaves, Vines, Vine Limbs, Vine Sprouter, Transpiration and Flowering) would cause a downgrade of shifting bark. Since jaundice does not change into what the latter downgrades into (protective bark), the mutation system attempting to get jaundice would result in never being able to get shifting bark again.

Related to bark having troubles, shifting bark was not enjoying blister resist that its predecessor got.

Describe the solution

Add more prereqs to the afflicted mutations.

Replace the check of bark with a character flag (and add them to the bark variants), thanks Venera. (Yes, there is unseen conversation, this is a restart of #73912 that was borked up due to forking shenanigans.)

Describe alternatives you've considered

Testing

It just works. I say that in the confidence a toe-dipping level of test can give me.

It builds, the flag seems to work, and the prereqs produce the expected result.

Additional context