QtIFW

Let the app parse the arguments again in gui mode.

Also do not stop on unknown arguments, this is rather stupid
to do, just print the error message. Might fix a problem on
OSX with session id...

Change-Id: I9ca6903b0073ea54b398534c5273f7f0f2e50db4
Reviewed-by: Tim Jenssen <tim.jenssen@nokia.com>
Reviewed-by: Niels Weber <niels.2.weber@nokia.com>