widget style cleanup

[Maksim Orlovich]

> Actually during our artist-BoF session we already talked about this. As
> far as
> I remember we agreed that Plastik should be the default style in
> accordance

Not that I'd ask that the performance problems in plastik be fixed if it
is to become the default. I also think you're being a bit short sighted
presuming we wouldn't come up w/something better for 4.0