Rework The Nobreathe Trait

[Leanfrog]

This is in response to the active PRs to rework Diona And Slime People, instead of shoehorning in the need to breathe simply to accommodate for newcrit, why not rework nobreathe to be in a state that doesn't make one immune to oxygen damage but removes the need for breathable atmos, this would allow Diona and Slime People to retain their immunity to atmos while still being compatible with newcrit, now this may be harder than I think but it feels like a very reasonable thing to change instead of removing their innate ability to ignore atmospheric contents.