* added functionality for LoRa Alliance TR-13 Enabling CSMA for LoRaWAN
* Addressed feedback on CSMA implementation
* symbolNumValues[6] array no longer needed as we will utilize only two symbol CAD operations for all SFs.
* Implement session persistence & more 1.1 protocol
* [LoRaW] Improve session persistence, check frame counters & Nonces, multiple MAC commands
* [LoRaWAN] fix popping MAC command from queue
I just realized that the method popMacCommand did not correctly remove items from the queue - this should solve the problem
* [LoRaWAN] implement improvements from #835
* [LoRaWAN] String --> uint8_t[]
* [LoRaWAN] Fix typo
