- Remove the use of private qt api. This did not work as intended
so the status was never updated. When there was no instance of
networkingcontrolmgr. (The minimalnetworkingclient used to test
before does that)

- Instanciate WinCE Networking Control Manager because it handles
the Window Messages notifing about a Network status change.

- Create the Networking control manager as a child window
of the correct qt main window. So Messages are recive correctly
even in multithreaded applications with multiple windows.

- Cleanup debug output a bit.