needs kdsoap >= 1.8.50 (current master).
builds a static variant of kdsoap-ws-discovery-client but can also
use system's version if available.
also reinvents how discovery works:
there are now Discoverers for dnssd and wsd that get started/stopped.
the Discoverers discover servers and emit them as Discoveries. Discoveries
are then converted to udsentries for kio.