Further Engine Edits

-Added access requirements to engines in pump.
-Switched bypass pump's default state to off
-Moved core ejection button to be near core vent button, accessible to
all engineers
-Removed one of the secure airlocks leading into the engine, due to
being blocked by the filter
-Replaced windows for core with plasma glass
Merge pull request #5 from kbernges/master

Further Engine Edits