automat: the next generation

[glyph]

Fixes #145

obviously needs tests and perhaps some more thought (in particular… how would feedback state-changes work here?) but I think this might be cleaner than the methodical machine

Stuff to do before landing:

• full test coverage
• examine .to/.upon ordering for better type errors
• visualization cleanups: outputs need much shorter, pithier names that look good in a visualization (inputs and states are OK)
• deserialization: it needs to be possible to instantiate a type machine in a particular state, with a particular state-specific data if it's a data state. (the serialization half can be done with a regular input)
• documentation: all the documentation needs to be rewritten to use TypeMachineBuilder
• internal naming: _typified is a bit of a silly name, renaming to something like _typed would be better.
• typing: possibly TypeMachine needs to be public so that people who want to call .asDigraph (or whatever the tracing or serialization APIs are) can still annotate their return types
• additional safety:
  • any mutation to the type builder (builder.state, state.upon, upon.to etc) must raise an exception if .build has already been called
  • all methods should be checked for membership in their protocol, to ensure that free functions are not used that create conflicts
• style: make up my mind on snake_case vs. camelCase

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (2da0af1) 91.82% compared to head (9466e8f) 94.18%.

Files	Patch %	Lines
automat/_typical.py	99.19%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk     #137      +/-   ##
==========================================
+ Coverage   91.82%   94.18%   +2.36%     
==========================================
  Files          11       13       +2     
  Lines        1260     1806     +546     
==========================================
+ Hits         1157     1701     +544     
- Misses        103      105       +2     

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