QtIFW

Remove pointer, superfluous members. Use signals and slots.

Use signals and slots to tell about the shutdown request.
Instead of passing around the server pointer, give the port
and key as parameter.

Change-Id: I0ad1667aa1caee4ffdee8b6951336f2254974810
Reviewed-by: Niels Weber <niels.weber@theqtcompany.com>