Newsletters HTML editor, Modal confirmation, CDN images

- Modal confirmation replace with something better open-classifieds/openclassifieds2#963
- CDN images open-classifieds/openclassifieds2#961
- Fixes newsletters editor usage of HTML editor not BBCODE open-classifieds/openclassifieds2#981
Yep. But problem is when user deletes a image on `oc-panel/profile/update/` then the images are not necessarily ordered, some image numbers can be missing.