Bay shuttles

Porting Zuhayr's work on shuttles.
- Moves all shuttles to a common generalized system in the
modules/shuttles directory.
- Adds a controller for shuttles to replace the current list populated
at roundstart.
- Shuttles can now be moved through a common adminverb and not a fuckton
of separate ones.
This may break a few things in the case I forgot something. May or may
not fix the vox skipjack.