Add houses for existing basements

[curstwist]

Summary

SUMMARY: Content "Adds 5 houses for existing basements."

Purpose of change

Covers basements: meth (3 for 1 house), chem (2 in 2 houses), survival, weed

Describe the solution

It was easier to add houses then reshape these to existing floor plans. I'll add empty variants later.

These basements didn't have the "NO_ROTATE" tag in overmap_terrains and all went under the generic "basement" ID. They did have entries in the mapgen for "rotate": [ 0, 3] which I removed. Please let me know if additional work needs to be done for migration.

Describe alternatives you've considered

These will need empty variants so I can weight their spawns since they are pretty specialized. Those can be added later though.

Testing

Spawned in world.

Additional context

house 26:

house27:

house28:

house29:

house30:

[I-am-Erk]

So many houses!!