[LoRaWAN] Rework bands, official Rx windows, support ADR, confirm frames, improve EEPROM handling, support clock drift (#867)
* [LoRaWAN] rework bands, add ADR, partial MAC support
Known problem: terribly bad at receiving downlinks
Mask-list bands (e.g. US915) untested, likely a few bugs
* [LoRaWAN] Change Rx windows from CAD to RxSingle
* [LoRaWAN] improve persistence, better Rx windows, wear leveling, confirmed frames
* [LoRaWAN] Module-independent (OTAA) Rx windows, fix confirming downlinks
* [LoRaWAN] Implement SX127x support, fix MAC uplinking, support clock drift
* [ArduinoHal] fix clock drift calculation
* [LoRaWAN] Improve band & ADR logic, allow setting ADR, DR, subband, update examples
* [LoRaWAN] Fix EU868 coding rate, improve example
* [LoRaWAN] fix unused channel index
* [LoRaWAN] fix merge issue (deleted line)
* [LoRaWAN] fix CSMA calling now incorrect function
* [LoRaWAN] fix include logic
* [LoRaWAN] fix warnings, remove duplicate function
* [LoRaWAN] improve examples, add unified sendReceive, bugfixes, add FSK
* [LoRaWAN] improve examples
* [LoRaWAN] add new keywords, add debug guard
* [SX127x] Updated startReceive interface to be more in line with SX126x
* [SX127x] Added public method to convert from bytes to symbols
* [LoRaWAN] Update start receive for SX127x
* Added note about LoRaWAN beta
* [SX127x] Fixed potential float overflow
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Co-authored-by: jgromes <jan.gromes@gmail.com>
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