CAS tools

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23300 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fixed warnings + debugging

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23301 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Clear toolbar first

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23302 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e