Some plugins will have to be written for each editor to make integration with Moodle possible. These should be as abstracted as possible, to make as much code as possible common between each. Since editors will be located under /lib/editor, let's store this common code under /lib/editormod.

    * File browser: the file browser (especially with the File API) will be Moodle specific
    * Emoticons (smileys): Moodle defines its own list of emoticons, we need to make sure the editors use these consistently
    * Language files: Moodle has a lot more languages than any editors, and some strings will be Moodle-specific. We need a way to make for each editor to use Moodle strings, reusing as many existing strings as possible, and using lang/xx/editor.php for the rest.
    * Equation editor: there is ongoing work to get Dragmath working in Moodle, making a common plugin could be a nice improvement
    * Multilang: all editors need to support multilang properly.