Improved compatibility with other mods that mess with sculptures

Changed mixed block usage in recipes to whitelist
Fixed compatibility issue where a patched method was called in an unexpected way

Fixed issue with Rimworld 1.1 compatibility

v1.3.1

Removed a number of buildings that appear during worldgen from the list of buildings that can be built using Mixed Stone Blocks. They will be added back once we have proper graphics for them.

Mixed Stone Blocks are now stuff. This allows us to remove the custom wall building and move mixed blocks to the stuff list for building normal walls (this also fixes a bunch of behaviors where the custom walls weren't treated like normal walls in all situations).

Now that Mixed Stone Blocks are stuff, we have added them as valid stuff for the following structures:
- Walls
- Columns
- Doors
- Autodoors
- Sculptures

Fixed bug where Mixed Stone Walls had only 3 hit points instead of 325

Added support for Rimworld 1.2

Tweaked hit points and beauty for Mixed Block walls

Rearranged mod files in an attempt to prevent hash collisions and random mod errors

- Fixed the flammability of mixed stone walls
- Mixed Stone Blocks are no longer valid stuff for vanilla walls

- Hopefully fixed a bunch of weird texture bugs
- Added recipe to make mixed blocks directly from stone chunks