Better network handling

[brentru]

This pull request:

• ADDS a network FSM that checks network and MQTT connectivity. Handles network re-connection and mqtt re-establishment.
  • All library functions which publish or poll now execute the FSM prior to calling their network action, to avoid network dropouts.
• FIXES Registration publish causing throttle loop #117 - Registration publishing causing throttling
• FIXES MagTag build stuck in boot-loop #101 - MagTag boot loop
• MOVES AnalogGPIO/DigitalGPIO classes to new components folder
• REMOVES old networking code in favor of the network FSM