[MERGED PR] rebalance genetics cold/fire/thermal res

[Solenoid]

I feel like people trying to metagame and say "omg it's a changeling b/c they can walk in space" is not really an issue I've seen enough to warrant the removal of thermal res auras. People in the github thread have mentioned this, but if everyone has fire/cold/thermal res, even just 25%-50%, you want to know that before attempting to firebomb places, or before you try to use a cryo grenade on a squad of secoffs. I get that these are somewhat niche cases, but I would say that the number of times I've been caught as a ling because I can spacewalk is maybe only 1-2 ever, if that, so that's a pretty niche scenario as well.

I think it'd be a bad idea to remove auras, but I think the changes to the actual protection values are good. I'd much prefer to just see this PR without the aura removal, personally.