platform specific cordova.js added

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27338 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3241 double cell fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27340 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e