Add protection against adding new annotations while editing

 * Update Annotator to dd6f102d (typed-packaging branch)
   * Several internal fixes, tweaks and cosmetic changes
     (Now it's fully functional in Stand-alone mode, again.)
 * Follow Annotator API changes
   * `noMatcing` option renamed to `noDocAccess`
   * `ignoreMouseUp` option renamed to `canAnnotate`,
      and the semantics got inverted
 * The bridge plugin now propagates the 'enableAnnotating' events
 * Added an `isEmpty` method to the draft service
 * When editing/replying/canceling/saving in the sidebar,
   enable/disable annotating.

Fixes #949