Change log:
- new boards: Thinknode M6, M3, RAK3401, RAK11310, Meshtiny
- nRF low power recovery manager
- sensor fixes: BMP280, LPS22HB, SHTC3
- new “clkreboot” CLI
- on-boot adverts now zero-hop
- remote “get/set prv.key” CLI
- new “get/set owner.info” CLI
- flood.advert.interval range now 3..168 hours
- MCU temperature now in telemetry responses