Added roofs to FEMA 2 buildings

[PatrikLundell]

Summary

None

Purpose of change

Add roofs to the buildings in the FEMA 2 camp without relying on add_roofs magic (which doesn't do tents anyway).

Describe the solution

Add a roof nest for each tile version that needed one and then nest it into said tile.

Describe alternatives you've considered

• Add roof decorations.
• Add solar panels on the real roofs to make it worth visiting this horrid place.
• Restructure the mess into a single file.
• Restructure the mess so the tiles don't have to be rotated.
• Restructure the mess to a similar structure as the first FEMA camp uses.

Testing

Spawn a FEMA camp 2, teleport to it, inspect it.
Repeat the above 9 more times to get a decent chance of covering all variants.

This is number 5, with no particular reason for selecting that particular instance over any other:

Additional context