Add function to change register (REG_INVERTIQ) to support communication node and gateway
The register does not exist in datasheet but use on but used in Semtech code.
Reference : https://github.com/intel-iot-devkit/upm/blob/master/src/sx1276/sx1276.cxx
* Add LoRa Simple Gateway/Node Exemple
Example how to use InvertIQ function to create a simple Gateway/Node logic.
* Add support for Arduino MKR WAN 1300 board
* Add new LoRa.setSPI(...) API to use radio with a different SPI interface
* Disable LoRa.onReceive(...) and LoRa.receive() on Arduino MKR WAN 1300
* Add errors on sketches not compatible with the Arduino MKR WAN 1300
* Add getting the frequency error of a packet
* Update for review comments
* Add functions to set low data rate optimization flag
* Typo
* Fixes
* Add packetFrequencyError to API.md
* WIP
* Simplify
* Make getSpreadingFactor private
* Correct LDO bit calculation
* Update LDO determination
* Correct calculation
* Correct calculation
* Revert back to old LDO calculation