refactor!: Rename states -> projects

[tony]

• refactor!: Rename states -> projects
• GitRepo, SvnRepo, HgRepo -> GitProject, SvnProject, HgProject

[codecov]

Codecov Report

Merging #327 (3b3a5de) into master (308b469) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #327   +/-   ##
=======================================
  Coverage   72.34%   72.34%           
=======================================
  Files          21       21           
  Lines        1685     1685           
=======================================
  Hits         1219     1219           
  Misses        466      466           

Impacted Files	Coverage Δ
tests/projects/test_hg.py	95.23% <ø> (ø)
libvcs/projects/base.py	100.00% <100.00%> (ø)
libvcs/projects/constants.py	100.00% <100.00%> (ø)
libvcs/projects/git.py	76.77% <100.00%> (ø)
libvcs/projects/hg.py	100.00% <100.00%> (ø)
libvcs/projects/svn.py	64.89% <100.00%> (ø)
libvcs/shortcuts.py	100.00% <100.00%> (ø)
tests/projects/test_base.py	100.00% <100.00%> (ø)
tests/projects/test_conftest.py	100.00% <100.00%> (ø)
tests/projects/test_git.py	99.38% <100.00%> (ø)
... and 2 more

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