AT command parsing and default fPort changes

Allow upper and lower case and special characters in AT commands after the "="
Change LoRaWAN default fPort from 0 to 1

Fix dependency to CayenneLPP

Ownership of library has changed, PIO couldn't find the library

Rework AT commands

• Make AT+PBW and AT+P2P compatible with WisToolBox
• Support RAK11300 with Arduino-Pico BSP

Make ESP32 work with WisBlock-API-V2

Not 100% tested on RAK11200, but should work

Fix AT+PRECV command

Set RX_CONTINOUS depending on receive mode and re-initialize the LoRa transceiver

New feature/bug-fix

• Fix missing return value for ATC commands
• Add option to re-init LoRaWAN stack

New features & Fix more compatibility problems with latest WisToolBox version

• Give correct ATC+.... return instead of only AT+... for custom AT commands
• Add AT command for force OTA DFU mode on RAK4631
• Add re-initialize function for LoRaWAN (fix problem with confirmed msg NAK)

Smaller problem fixes

• Add g_rx_fin_result = false; for LoRa P2P and call TX callback if CAD returns channel activity found
• Fix compatibility problem with latest WisToolBox version by changeing AT error return values from +CME... to the new error strings

Add option to set device alias

Device alias can be used to identify the function of the device, e.g. Helium Mapper, Environment Sensor, ...
At the moment the device alias will be queried by the WisToolBox only.

Enhancements

Enhance AT+BOOT to work with RP2040
Add option for custom boards (no LED's no BLE advertising)