Fully Immutable

[IamTheCarl]

This update has been a long time in the making and overhauls just about everything.
Where to even start my summary?

I must apologize for the absolute mess of the commit history. There were moments where I realized my design painted me into a corner and I had to make major changes, and the time needed to clean the history just didn't feel worth it, especially since this project is not at a point where there are additional contributors.

What this brings:

• New parser uses TreeSitter
  • I've experimented with using topiary as an auto formatter. It was proven practical, but the syntax has since changed enough for that feature to be considered broken for now.
• Fully immutable language
  • It's very Nix inspired, but borrows a few ideas from Rust
• Replaced Fornjot with mesh based operations
  • This is not as flexible but it's more stable for the moment
  • There are plans to explore imperative modeling techniques, such as SDFs and/or UGFs
• Your model can be composed of multiple files