Call Attendant Release v1.6.3

Release package from forked Call Attendant repository.
See README.md for installation instructions, details on updates and features added since last release from @emxsys

Summary:

• Ability to store and edit regular-expression lists for blocked and permitted names and numbers.
• Option to send email notification of messages including optionally attaching the .wav file.
• Addition of "Permit Next Call" button to enable/disable automatically allowing the next incoming call or handle it normally (screened, blocked, etc.)
• CallerID patterns are now in a single file (YAML).
• Status indicators can be GPIO, MQTT or NULL (for none).
• Works with both USR and Conexant based modems.
• Automatic whitelist for caller pressing '0' when being screened.
• Add import and export functions for permit and block lists.
• eMail and MQTT config added to app.cfg.
• Notifications folder location added to app.cfg.
• Upgrade to Python3 strings vs. bytes in modem handling.
• Better detection of modem notifications and keypad handling.
• Remove unnecessary threading and events.

Install package by first downloading it and then invoking pip install within your virtual environment as below:

$ source venv/bin/activate
$ pip3 install callattendant-1.6.3-py3-none-any.whl