[Painter] PreLight only on selected Parts

[Balmung]

The PreLight should work like the other stuff like Stickers and Painting on the selected Parts only and not on the complete Skin, no matter what Part is selected.

That is a really important thing, for example to change the Wheel Colors and PreLight only this one.

Another wish that concerns the Layer Rubric are here: http://forum.maniaplanet.com/viewtopic.php?f=28&t=4965