Compile error fixed

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31736 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Add API method for storeUndoListeners

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31737 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e