This branch refactors the majority of main.py out into individual
modules to compartmentalize the code. Migrated all email related
features unti email.py, sending of messages into messaging.py
Also refactored all of the socket code to use aprslib for all APRS-IS
communication as well as message/packet processing.
Moved the email command into it's own Plugin.
This patch reworked the loading of plugins. Python2 is dead.
Previously was using the imp module to easily load the plugins from
a separate directory, which is a bit of a pita. Found a python3 lib
that takes care of the difference between py3.3, 3.4 and 3.5+ module
loading called "thesmuggler"
