Debugger[Trk]: Added TCF experimental adapter.

Added adapter to work with TCF over WLAN.
Factor out common code for Symbian from TrkAdapter.
Improve message logging in TrkGdbAdapter, some cleanup.
Added new TcfTrkGdbAdapter based on TcfTrkDevice
in symbianutils based on JSON, using QTcpSocket.
To be started via special @tcf@ argument.
Rubber-stamped-by: hjk

src/plugins/debugger/gdb/gdbengine.h

@@ -99,6 +99,7 @@ private:
     friend class RemoteGdbServerAdapter;
     friend class RemotePlainGdbAdapter;
     friend class TrkGdbAdapter;
+    friend class TcfTrkGdbAdapter;
 
 private: ////////// General Interface //////////