Unfucking cargo: take 2

- New icons for cargo areas because everyone who mapped before is a
retard.
- Cargo lobby, delivery and office are all separate zones with a proper
area and icon now.
- Delivery office now has a windoor at its desk and the plastic flaps
are now airtight.
Merge branch 'Bleeding-Edge' of https://github.com/d3athrow/vgstation13 into cargo_pls
Merge pull request #1495 from Duny-/cargo_pls

Unfucking cargo: take 2