refactor!: cmd.core -> utils.run

[tony]

Move to cmd.core -> utils.run. This is not to be considered a stable API in the near future - though we'd like to after it'd battle-tested.

[codecov]

Codecov Report

Merging #343 (29012ee) into master (01643ce) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 29012ee differs from pull request most recent head 85dba41. Consider uploading reports for the commit 85dba41 to get more accurate results

@@           Coverage Diff           @@
##           master     #343   +/-   ##
=======================================
  Coverage   74.80%   74.80%           
=======================================
  Files          26       26           
  Lines        1961     1961           
=======================================
  Hits         1467     1467           
  Misses        494      494           

Impacted Files	Coverage Δ
libvcs/utils/run.py	89.61% <ø> (ø)
libvcs/cmd/git.py	53.34% <100.00%> (ø)
libvcs/cmd/hg.py	69.73% <100.00%> (ø)
libvcs/cmd/svn.py	52.23% <100.00%> (ø)
libvcs/projects/base.py	100.00% <100.00%> (ø)
tests/cmd/test_core.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)
tests/projects/test_hg.py	95.23% <100.00%> (ø)
tests/projects/test_svn.py	96.15% <100.00%> (ø)

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