refactor!: move to libvcs.states

[tony]

No description provided.

[codecov]

Codecov Report

Merging #318 (006cc02) into master (e63c651) will increase coverage by 0.48%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #318      +/-   ##
==========================================
+ Coverage   86.62%   87.11%   +0.48%     
==========================================
  Files          16       15       -1     
  Lines         890      885       -5     
==========================================
  Hits          771      771              
+ Misses        119      114       -5     

Impacted Files	Coverage Δ
libvcs/states/hg.py	100.00% <ø> (ø)
libvcs/states/svn.py	64.51% <ø> (ø)
tests/states/test_hg.py	97.56% <ø> (ø)
tests/states/test_svn.py	95.23% <ø> (ø)
libvcs/states/base.py	100.00% <100.00%> (ø)
libvcs/states/git.py	74.01% <100.00%> (ø)
tests/states/test_base.py	100.00% <100.00%> (ø)
tests/states/test_git.py	99.37% <100.00%> (ø)
libvcs/states/constants.py

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