Using QskIcon in the public API

[uwerat]

In several controls images can be assigned directly via QskGraphic or indirectly as QUrl ( the image is loaded by a graphic provider ). QskIcon had been introduced for the menus to cover this duplicity instead of bloating the API of the classes using images.

However we still have several controls, where QskGraphic/QUrl are present:

• QskGraphicLabel
• QskPushButton
• QskStatusIndicator
• QskSubWindow

Maybe it is possible to use QskIcon for them.