#4491 keep track of which geos are used

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35851 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
avoid new

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35852 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e