use canvasmath (MathML) for FormulaText[object (not text)] in HTML5

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23919 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.111.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23920 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e