#4635 Tree resources to display open/close icons in branches

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36980 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4635 Separator text

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36981 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e