#8: Analyze states and invalid transitions

[moshez]

For now this is completely broken, but this is starting to refactor makeDigraph into a more general "transitions" stream which should power more flexible analysis tools without making it too easy to introspect machines in-code directly.

[codecov-commenter]

Codecov Report

Merging #134 (bc46e6e) into trunk (4260ebb) will decrease coverage by 27.31%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##            trunk     #134       +/-   ##
===========================================
- Coverage   91.83%   64.51%   -27.32%     
===========================================
  Files          11       11               
  Lines        1261     1285       +24     
===========================================
- Hits         1158      829      -329     
- Misses        103      456      +353     

Impacted Files	Coverage Δ
automat/_visualize.py	0.00% <0.00%> (-59.46%)	⬇️
automat/_discover.py	0.00% <0.00%> (-100.00%)	⬇️
automat/_test/test_discover.py	26.90% <0.00%> (-73.10%)	⬇️
automat/_test/test_visualize.py	37.31% <0.00%> (-29.86%)	⬇️
automat/_methodical.py	98.88% <0.00%> (-1.12%)	⬇️

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