This patch adds the new APRSRegistryThread,
which enabled in config, will send a small
packet of information to the as yet deployed
APRS service registry every 900 seconds.
The data that this thread will send is
the service callsign, a description of the service,
a website url for the service.
The idea being that the registry website that this thread
sends information to, will show all the services that are
running on the ARPS network, so Ham operators can discover
them and try them out.
Hemna