Continue on error by default

[tony]

Fixes #363, related to #366

CLI sync:

• Fix arguments on sub commands
• Continue to next repo if encountering error when syncing
• New flag: --exit-on-error / -x
• Also stubs out basic CLI tests

[codecov]

Codecov Report

Merging #387 (cf7d195) into master (ea44ca6) will increase coverage by 5.40%.
The diff coverage is 91.04%.

@@            Coverage Diff             @@
##           master     #387      +/-   ##
==========================================
+ Coverage   80.17%   85.57%   +5.40%     
==========================================
  Files          15       15              
  Lines         787      846      +59     
  Branches      113      128      +15     
==========================================
+ Hits          631      724      +93     
+ Misses        130       89      -41     
- Partials       26       33       +7     

Impacted Files	Coverage Δ
src/vcspull/log.py	68.42% <ø> (+38.59%)	⬆️
tests/conftest.py	98.73% <ø> (+5.06%)	⬆️
src/vcspull/cli/sync.py	58.75% <76.92%> (+12.37%)	⬆️
tests/test_cli.py	94.82% <94.44%> (+44.82%)	⬆️
src/vcspull/config.py	86.23% <0.00%> (+1.44%)	⬆️

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