Explicit roof on storehouse 1

[PatrikLundell]

Summary

None

Purpose of change

Give basecamp expansion storehouse version 1 roof explicitly rather than relying on magic.

Describe the solution

Same as previous cases, extend palettes, add roofs based on the ground floor, and make use of the roofs and 3D coordinates.

Describe alternatives you've considered

Testing

• Loaded a suitable save.
• Sent a companion to survey and then build each structural section. The first 8 in different materials to cover the material range.
• Check that the results look as expected.
  

Additional context

The expansion to the south was created due to autosave, and the construction on it due to construction in the wrong expansion (but the material was used for a "real" segment as well).