Bed and mercenary shuttle refactoring.

Re-arranges the dormitory bedrooms again. Slightly fewer beds, slightly more maintenance.
Re-shapes the mercenary shuttle airlock and docking points to restore the cabin compartment shape.
Gives the xeno/viro some raison d'être until a something more can be done about it.
Merge remote-tracking branch 'upstream/dev' into Beds
Merge remote-tracking branch 'upstream/dev' into Beds
Merge remote-tracking branch 'upstream/dev' into Beds
Merge remote-tracking branch 'upstream/dev' into 'origin/Beds'.

Conflicts:
  maps/exodus-1.dmm
Merge pull request #7207 from PsiOmegaDelta/Beds

Bed and mercenary shuttle refactoring.