refs #308 Instead of enumerating hosts, use the well known host url

Since we are hosting in the same process, we can get the URL from the host
object and pass it to new clients.

src/plugins/simulator/fs9/directplay_peer.h

@@ -71,6 +71,9 @@ namespace BlackSimPlugin
             //! Creates a new DirectPlay device address
             HRESULT createDeviceAddress();
 
+            //! Creates a new DirectPlay device address
+            HRESULT createHostAddress();
+
             QString m_callsign; //!< Peer callsign
 
             IDirectPlay8Peer *m_directPlayPeer = nullptr; //!< DirectPlay peer address