MLStyle 0.5 design

[thautwarm]

0.5 is 1.0/2!

I propose the following features:

1. Improve documentations. Years later, I've finally learned about technical writing!
2. Bootstrap MLStyle with MLStyle, the distributed code will contain NO macrocalls.
3. Support enums as a builtin pattern: #126
4. Preliminary warnings for unused cases #127 #105
5. (possible) MLStyle as dev-only dependency while supporting active patterns #121
6. slurp tuples: #99

[thautwarm]

7. Support patterns like a.b
8. Using new terminologies improved from https://peps.python.org/pep-0622