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, apc and icon now.
- Delivery office now has a windoor at its desk and the plastic flaps
are now airtight.
- I have no idea if I'm doing this new changelog thing right but I'm going to pretend I do.

Let's hope this finally fixes it.