Using any/all/* will now listen on both IPv4 and IPv6 if available.
To force IPv4-any, use `0.0.0.0` and similar `[::]` for IPv6.
The loopback value listens on IPv4 and the new ipv6loopback value selects IPv6 loopback. It is not possible to get both loopback values at the same time.
Kept the infrastructure to allow re-introducing it later if a better source for a device key is found.
Added support for not having any valid settings encryption key.
Added warnings if the user is running without a settings encryption key.
Added additional checks during startup to help with troubleshooting and configuring a setup with a settings encryption key.
Docker builds will now warn if no encryption key is set.
This fixes#5518
Kenneth Skovhede