[PR] Teg updates

[Studenterhue]

Hey, remember this? It's merged now. The changelog for it is much more descriptive now than "tweaked TEG". The code changes specifically merged involve circulators accepting chemical reagents. Chem mixtures affect performance based on viscosity, space lube and superlubricant boost it by a flat amount, and cryostylane and pyrosium cool/heat up the gases passing through.

You probably know the drill now; if you have feedback, make a thread! This is particularly important since these particular changes are experimental, so feedback is extra useful.