Supermatter Tweak

- O2 Primary mode now actually works.
- O2 has to be at least 14% (instead of previous ~80%, WTF?) of core composition to actually have any effect on the core, considering all remaining gas is N2 (so realistically it's somewhere around 13-14%). Tested it, single canister of O2 is enough to slowly power up the core without actually using the emitter.