Switch off code highlighting for now

- Blur doesn't work in the source mode of ckeditor. This has to do with
  the codemirror plugin, which basically replaces the whole editor with
  codemirror. But the blur event (triggered by codemirror) doesn't end up
  in our code
Add extra css class to optonal param buttons

This makes it possible to have one set of rules to enable/disable buttons
in the css file.
Change url filed to type script
Fix table editor.

- Still needs cleanup!