Xeno mode fixes
Fixed nuke shuttle being a swirly vortex of death.
This bug was actually in legacy ShareSpace code,
I'm surprised it wasn't noticeable in the old ZAS.
Added lighting code, didn't include it yet.
Lighting system is too buggy to continue until I know wtf is going on

Conflicts:
	baystation12.dme
	code/game/turfs/turf.dm
Lighting seems to be working now.
Lighting code complete.
ChangeTurf()... We meet again...
Fixed ghosts' lighting toggle. Mesons still look weird.
Reverted unrelated ZAS modification and unnecessary check.
Merge pull request #68 from ZomgPonies/master

Lighting update