Symbols as SkinHints

[uwerat]

Instead of retrieving default graphics ( f.e. check box indicator, info/warning/error symbols ) from the skin using the QskStandardSymbol::Type enum it would be more flexible to use QskAspect::Subcontrol and to store them in the skin hint table.

We probably would need a new QskAspect::Primitive "Symbol" that can be used in combination with QskAspect::Flag.

Obviously a graphic is no flag, what raises the question if we should introduce a new value for QskAspect::Type: f.e QskAspect::Graphic ?