Updates:
- Added image resizing API and frontend in the filemanager
- Made several improvements for e.g. system pages
- Improved our caching algorithm's, and added dns prefetching for better performance
- DHL shipment fix
- Added a new page adding interface
- Added a unique article url checking for articles
- made it possible to load an additional js on a page (via page.json)
- Made minor GDPR updates
- base64 capabilities in download.php
- moved some javascript system parts to our static cdn
- minor bugfixes, system cleanup and improvements