configurePainter refactoring:

The intent of the previous implementation had been mudded and was
undocumented. For better optimization and maintenance the
configurePainter method is split into three variants:
configureForOutlinePainter, configureForInlinePainter and configureForLabelPainter.
The code is documented and optimized.

TODO:
1. move the save() and restore() methods out of the individual
calls to embrace all calls of outline, inline and label painting.
2. refactor the drawLabelForPolyline method rely on fontsize
rather than taking a full Pen.