Mosquitto default to not retain published messages...
Cleanup bt2mqtt, gpio2mqtt, rf24mqtt, and mqtt2sqlite
Enhancing RF24Node

* Default to RF24_1MBPS and RF24_PA_HIGH
* Change via commandline parameters
* Debugging via commandline parameter
* RF24NetworkHeader 'T' - Nodes request timestamp; RPi sends timestamp
* RF24NetworkHeader 'C' - Nodes send a challenge code; RPi replies w/a siphash and the command
Plugins start with the rest of the Ripcord