Strict mypy

[tony]

Strict mypy typings.

This is lots of changes.

[codecov]

Codecov Report

Merging #390 (3f67566) into master (80db558) will decrease coverage by 0.80%.
The diff coverage is 70.61%.

❗ Current head 3f67566 differs from pull request most recent head 55e6190. Consider uploading reports for the commit 55e6190 to get more accurate results

@@            Coverage Diff             @@
##           master     #390      +/-   ##
==========================================
- Coverage   73.64%   72.84%   -0.81%     
==========================================
  Files          26       26              
  Lines        2178     2250      +72     
==========================================
+ Hits         1604     1639      +35     
- Misses        574      611      +37     

Impacted Files	Coverage Δ
tests/parse/test_git.py	100.00% <ø> (ø)
tests/parse/test_hg.py	100.00% <ø> (ø)
tests/parse/test_svn.py	100.00% <ø> (ø)
tests/projects/test_conftest.py	100.00% <ø> (ø)
libvcs/projects/svn.py	50.37% <30.18%> (-14.90%)	⬇️
libvcs/cmd/svn.py	52.23% <51.51%> (ø)
docs/conf.py	62.10% <71.42%> (-0.27%)	⬇️
libvcs/parse/base.py	86.11% <83.33%> (-2.13%)	⬇️
libvcs/projects/git.py	74.63% <86.66%> (-1.18%)	⬇️
libvcs/projects/base.py	92.53% <90.90%> (-1.31%)	⬇️
... and 16 more

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