* add command to display vanity callsign rules
* store callsign info in a separate file for extensibility
* Update callsign_info.py
* Update callsign_info.py
* fix gitignore, make pfx command extensible, fix US formatting
* linting with flake8 and pylint
* add type hinting
* more linting
* and i oop
* revert caps
* update info
* remove unnecessary docstrings
* Update info.py