Refactor the command line interface

[JeffreyMFarley]

Using the PASP project as a reference. Refactor the loose set of __main__ routines and inconsistent naming convention to be a unified, coherent toolset

Idea

• pyTagger - __main__.py
  • files
  • prepare - prepare_check_in.py
  • rename - rename.py
  • update - update_from_snapshot.py
  • images - extract_images.py
  • snapshot
  • new - mp3_snapshot.py
  • export - snapshot_converter.py
  • import - snapshot_converter.py
  • upload - proxies/es.py
  • match - TBD