MathQuill fixes for the future fonts (also good for now, probably)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29294 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Make CommandDispatcher abstract

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29295 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Yet another MathQuill sqrt commit: fixing cube root (although with a better sqrt sign in the font might look even better)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29296 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Compile errors in Touch fixed

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29297 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e