Plasma themed tabbox

[Martin Gräßlin]

I worked on Plasma themeing the normal tabbox (without effects). So far 
everything seems to work ;-)

As this is my first work on anything related to QGraphicsView/Plasma I cc-ed 
Plasma devs. Please have a look at the patch and tell me what I have done 
wrong (probably thousands of things). Especially there is still a white border 
around the tabbox and I don't know how to get rid of it.

The old tabbox highlights the background of the active item. I decided to just 
change the font of the item (underline and bold) and apply an icon effect. I 
don't know if it is enough to indicate the currently selected item.

Minimized windows used to have a different color. Here I choose an italic font 
instead. Icon effect still the same.

Here some screenshots:
 * http://img7.imageshack.us/img7/4466/plasmatabbox.png
 * http://img25.imageshack.us/img25/9282/plasmadesktopbox.png

Regards
Martin
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