UPNP discovery of the Raspberry Pi
This release implements a SSDP discovery of the raspberry pi instead of a manual devicehandler former parameters.
After installing the Honeywell HPA250B UPnP Service Manager smartapp, the raspberry pi is discovered and the devicehandler is installed and configured accordingly.
Inspired by others work mentioned in the sources/licence notes.
This version implements pre-Filter usage indicator (functional) and prototype EPA filter usage indicator (not functional yet).