initial commit (#1117)

- added an interior exit button to the xenoarch chambers
- added some extra wires in the engi outpost
- moved corpsman medicine locker
- gave det back their extra rubbers that somehow got deleted
- fixed maints above singulo not having power
- put a mass scanner on salv dock, gave them one handheld to start with
- gave perma a dinnerware crate and more instruments
- improved firing range (conveyors!!!)