* Implementing alternative to Math2D.SegmentIntersectionWithSegment that can deal with degenerate situations and special edge cases such as overlapping lines. * Extended Point2D with addition of 2D vector operator. Related to Issue [WTI-433] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@2646 5a3db67b-de53-47b5-99c8-a1c30a6650e2