Working ScanLineFill
Prepare for merge.
Merge branch 'pra-dev'

Conflicts:
	src/Graphics2D/IntersectionPoint.hh
	src/Graphics2D/PrimitiveLine.cpp
	src/Graphics2D/PrimitiveLine.hh
	src/Graphics2D/PrimitivePolygon.cpp
	src/Graphics2D/PrimitivePolygon.hh