QmlDesigner: Make it easier to add new arguments to the puppet

Change-Id: I15bc4a1a431787e350ace9fa09d8c140d06a7ed6
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
QmlDesigner: Remove code which does nothing

Change-Id: Ia6edcd10c42f0ef71ed1237e45185e5fd8a4a66e
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>