fixing view-configs of types, extending CKEditor integration.

Fixes:
- "resources" and "tags" now show up in the "Create"-Menu of dm4-webclient
- if there are no tags in the system yet, return all for creation

Improvements:
- CKEditor comes now with support to use <embed> codes in new posts

Pending:
- allow users to manipulate the tag-filter per item
- enable users to edit and delete tags in single-resource/detail view

Testing continues.