Bug fixes

Changes:
1) Kill_count now works properly (so xray beams no longer keep going indefinitely).
2) The alien shuttle now starts airless and has simulated walls.
3) Adds additional hyperspace to the alien shuttle. Note that the hyperspace is still the wrong way around, but that's a real pain to fix. I'd rather see the alien shuttle redesigned.
4) Internals that are on a belt can now be turned on.
5) Adds an "Empty Pockets" option which empties both pockets on the floor. 
6) Adds a "Remove Accessory" option which removes any accessories on someone's uniform.
7) Adds a "Set Sensors" option which enables suit sensors.
8) Replaces the separate (useless) shotgun shells in the secure armory with two ammo boxes so they can properly carried by the people taking the riot shotguns.