New feature: auto-update apkovl file with latest release on master
gadget: improved setup if several ports available and/or some unconnected
wlan: only install & start wpa_supplicant if needed
updated doc
unattended.sh script may disable sshd (#NO_SSH option)
gadget mode: enable both USB serial terminal and USB-ethernet networking
check new version availability online (notified on login banner & logs)
redesigned as OpenRC services
many other minor improvements