Improved stability calculation is in!
Still needs some small tweaks but it is much closer to Rust now with pillars and unsupported floors. What a pain in the ass that was.
- added lantern and shopfront
- foundation steps can no longer be free-placed, fixed not always being able to place up and down
- hitting tab or changing parts exits edit mode
- more accurate height check for foundation parts (can go higher now)
- added height adjust for placing copied or merged structures
- fixed a bunch of issues with door codes