Trio is now typed, no need for trio-typing

[mikenerone]

trio-typing is generally a bit broken and causes type-checking troubles for users (e.g. me) when pulled in by tricycle. Also updated the support Python versions (3.7 EOL, long live 3.12).

[mikenerone]

There are currently some typing warnings on a bunch of the start_soon() calls in the tests, but I'm failing to spot why the "expected" signature is so strict (accepting only a single positional arg?). I might just be tired. :P

[graingert]

@mikenerone fixed by upgrading mypy #25

[mikenerone]

@graingert Thanks! I was totally missing it being a mypy bug. I've pulled your commits into this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d9226be) 100.00% compared to head (4ea9df8) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #24   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        15           
  Lines         1312      1306    -6     
  Branches       216       216           
=========================================
- Hits          1312      1306    -6     

Flag	Coverage Δ
3.10	99.92% <100.00%> (-0.01%)	⬇️
3.11	99.92% <100.00%> (-0.01%)	⬇️
3.12	99.92% <100.00%> (?)
3.12-dev	?
3.7	?
3.8	99.92% <100.00%> (-0.01%)	⬇️
3.9	99.92% <100.00%> (-0.01%)	⬇️
Ubuntu	99.92% <100.00%> (-0.01%)	⬇️
Windows	99.92% <100.00%> (-0.01%)	⬇️
macOS	99.92% <100.00%> (-0.01%)	⬇️
pypy-3.8	99.30% <100.00%> (-0.01%)	⬇️
pypy-3.9	99.30% <100.00%> (-0.01%)	⬇️

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[oremanj]

macOS is still building on 3.7 which now fails. 3.13-dev seems broken, you can remove it from the matrix.