Intersect segments between a line and a polygon (2D/3D):
* setLabels()
* copy visual style for new segment

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@22847 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
3D polygons with vertices on a line are defined

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@22848 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e