Dev-Freeze fixes: Heaters, Freezers, Supermatter

* Fixes #6123
* Reduces SM charging rate and increases output a bit. It should now be possible to start the engine without varedits. The engine output will likely need further tweaking, however this will probably have to come from playtesting. The engine layout still needs to be changed but I'm not sure what the best starting layout would be yet, and I'd rather not make any mapping changes until  #6133 is merged.
* I also plan to adjust the airlock air canister ```filled``` values to get airlocks to cycle faster, but again, not going to do any mapping changes yet.
Update:
* Adjusted SM reaction parameters so that SM high-oxygen mode isn't so uncontrollable.