paintop returns QPainterPath and tool is responsible for
painting and conversion from pixel coord into view coordinates.

Thanks to KisTool::paintToolOutline, native OpenGL code is
used for OpenGL canvas so drawing might be faster and
outline is always visible due to using XOR. XOR is also used for QPainter-based canvas.

So far only paintops with standard brush dialog are ported and duplicate paintop is ported.
The outline for duplicate is new and experimental (no more just cross). It has bug due to wrong size
of the bounding rect, but works for OpenGL canvas.

Old API is still used if the paintop is not ported.

CCBUG:241289

svn path=/trunk/koffice/; revision=1150321