Rigid polygon and vector polygon work with 3D points

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35828 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Make sure sign out works again

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35829 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e