Release 3.4.4
This fixes bugs in the 3.4.3 release that affected Duet 2 WiFi, Duet 3 MB6HC, Duet 3 MB6XD and possibly Duet 3 Mini WiFi main boards. The firmware binaries for other boards have not changed except for the version number. See https://github.com/Duet3D/RepRapFirmware/wiki/Changelog-RRF-3.x#reprapfirmware-344 for the change list.