Moved tests related to ui into own folder.
Moved 'modify' command tests into own file.
Moved 'write' command tests into own file.
Moved 'fields' command tests into own file.
Moved 'do_query' test into own file.
Moved 'list' command tests into own file.
Moved 'remove' command tests into own file.
Moved 'move' command tests into own file.
Moved 'update' command tests into own file.
Moved 'show_change' test into test_import file.
Moved 'summarize_items' test into test_import file.
Moved 'completion' command test into own file.
Moved commands.py into commands/__init__.py for easier refactoring.
Moved `version` command into its own file.
Moved `help` command into its own file.
Moved `stats` command into its own file.
Moved `list` command into its own file.
Moved `config` command into its own file.
Moved `completion` command into its own file.
Moved utility functions into own file.
Moved `move` command into its own file.
Moved `fields` command into its own file.
Moved `update` command into its own file.
Moved `remove` command into its own file.
Moved `modify` command into its own file.
Moved `write` command into its own file.
Moved `import` command into its own folder, more commit following.
Moved ImportSession related functions into `importer/session.py`.
Moved import display display related functions into `importer/display.py`
Renamed import to import_ as a module cant be named import.
Fixed imports in init file.
