Event handling for marbles improved, still not working if ScrollPanel's content overflows

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26322 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
3D mirror at point

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26323 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e