Fix transforms for non-XRENDER by converting to a QImage, doing the transform using the raster paint engine and converting back to a QPixmap, rather than using the normal kpPixmapFX::draw() mechanism.

This is needed because drawing a transformed QBitmap on top of a QBitmap causes X errors and does not work, if XRENDER is disabled (Qt 4.3.1 bug).

The code is a lot simpler now and was probably the way it should have been done in the first place.