Fix P2P RX timeout callback fails

Fix callbacks for P2P RX and TX timeout not being called

Add support for the Arduino Pico BSP

Added support for the RAK11300 in arduino-pico BSP still experimental

IRQ_HEADER_ERROR should issue RX error, not RX timeout

Change behaviour of IRQ_HEADER_ERROR, thanks to @JeromeBriot

Some fixes

• Fix public/private network always public
• Add option to restart MAC stack to change e.g. region without re-init timers

Add MAC counter reset function

2.0.20

Add MAC counter reset function

Fix the release mess (hopefully)

2.0.19

Prepare for new release.

Fix typo in RadioTimeOnAir for FSK

2.0.18

Prepare for release

Enhancement

Improve RadioTimeOnAir for FSK, thanks to @mikedupi

Fix Confirmed message bug

• Fix runtime problem in LoRaMacHelper, thanks to @avillacis

Several fixes and improvements

• Updated examples, thanks to @DanielBustillos
• Cleanup RAK4630 initialization
• Add lmh_getConfRetries() to readback the confirmed package retry setting
• Make RX timeout configurable with #define RXTIMEOUT_LORA_MAX, thanks to @kisChang
• Add set default RX gain in SX126xSertRx, thanks to @kisChang
• Allow change of TCXO control with hwConfig structure, thanks to @dberlin
• Add confirmed failed callback if the degraded datarate becomes insufficient to transmit the payload length, thanks to @avillacis