Input box refactoring

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33524 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Alpha is back in CAS textfields

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33525 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e