argparse: Convert mopidy command
argparse: Convert mopidy-scan command
docs: Add argparse conversion to changelog
commands: Move --show-{config,deps} handlers to new module
commands: Move argument parser to commands module
commands: Use argparse to split config files into a list
command: Move override parsing into module
commands: Update override parsing tests
Merge pull request #441 from jodal/feature/argparse

Switch from optparse to argparse