Marble click listener

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23509 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Web: Visual feedback for CAS marbles

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23510 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e