[GeoLib] Corrected implementation of check if Polyline is in Polygon.

The check if a polyline is in a polygon is needed within the SimplePolygonTree.
I implemented ```Polygon::getAllIntersectionPoints()``` within the class ```Polygon``` since the algorithm operates on the polygon data. At the moment the method is only used from ```Polygon::containSegment()```. For this reason ```Polygon::getAllIntersectionPoints()``` is declared even private.

On the other side ```computAndInsertAllIntersectionPoints()``` works on a vector of polylines. Despite both algorithms are using ```lineSegmentIntersect()``` they operate in different ways.