--In the future dynamic coloring might be needed for
panels in the desktop. In such case panel colors might
be altered in order to follow the current active maximized
window colors or another case could be when the panel
is transparent and plasma theme colors arent providing
the best constrast with the underlying background.
This is a first step in order to support panels that color
themselves independently from the plasma theme or according
to the plasma theme but with best contrast at all cases.

Wanted by: T9769

Usage Example:

//Containment part

PlasmaCore.ColorScope{
   colorGroup: PlasmaCore.Theme.UserSetColorGroup
   textColor: "#f1f1f1"

   /*applets*/
}

//applet part

color: PlasmaCore.ColorScope.textColor //it is going to use #f1f1f1

-check that applets are coloring themselves accordingly
-check that previous behavior didnt break