Added explicit roofs to hub version 2

[PatrikLundell]

Summary

None

Purpose of change

Add explicit roofs to field basecamp version 2, plus vent pipe/chimney on top of stove/fireplace.

Describe the solution

Make use of the 3D specification functionality.

Describe alternatives you've considered

Not cutting a hole in the tent for stove/fireplace.

Testing

• Constructed one each of fireplace/stove with tent.
• Constructed all tents plus center in 4 materials with stove and fireplace.
• Constructed one each of foreplace/stove with shack.
• Constructed the whole base out of remaining materials plus mi-go resin for the remainder (easiest to spawn).

Note that the common, unchanged, constructions weren't tested (apart from a well, as I needed the water for construction).

Additional context