Add basements 1

[curstwist]

Summary

SUMMARY: Content "Adds basic basements to 9 houses."

Purpose of change

We need explicit stair placement between z levels. This begins adding basements shaped to each house foundation.

Describe the solution

I'll be adding these quickly so each house can have it's own stairs and it will alleviate the teleporting stairs in houses.

These basements are unfinished (as in basement style, not incomplete mapgen). They get some basic appliances like the hot water heater and furnace. Most also get a washer & dryer and a few random boxes.

Once all these houses have matching basements, I'll be adding variants or nested maps to add more variety.

Describe alternatives you've considered

I considered waiting to do this until 0.E, but the stairs in houses are messy right now since I added the roofs and broke up the ubiquitous "house" ID.

I considered waiting until I had nested maps or more interesting variants, but I think the stair mechanics win over variety. I do have houses to add to the current basements, so they won't be removed. Some will get an overhaul though.

I plan on making some of the special basements, like the gun theme, into nested chunks so they can spawn in a variety of houses.

Testing

Spawned in world.

Additional context

I did say basic:

This is for house_detatched 1 through 9.