new look and animation for applet handles, based on an old Nuno mockup, that uses the standard applet background (will have new graphics).

also, don't use painter->setOpacity anymore, so should be a bit faster

the look is slightly different in 3 cases:
-the applet is smaller than the handle, the panelsvg gets drawn completely and looks like the old thing
-shape not rectangular: the panelsvg is wider, so it's visible also for instance behind the clock circle
-normal: only a bit of the panelsvg exits from the applet and is visible, the hidden part has a few pixels fade out gradient to look less wrong with transparent backgrounds like folderview or themes with all backgrounds more transparent