Saveing Window Positions useing the QT defined methods as far as possible.

Saveing Window Positions useing the QT defined methods as far as possible.
On first start if there is no position info stored - try center the dialogs
on the primary desktop/screen. (or same screen as the controller)

the component playlist shall not save there settings to a fixed location,
so it may become problematic if we use the component twice - like it
is done. The location shall be given controlled by its owner component
or window.