revert changes to App

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27152 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
create new class InputField

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27153 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e