Changes
- Added watch state badges for posters showing if an item has already been watched or how many episodes aren't watched yet
- Added a context menu for the admin item actions
- Added a dialog to refresh the item metadata
- Moved the item delete button to the admin context menu
- Added a dialog to manage the images for an item
- Added a dialog to find new images for an item
- Added a dialog to upload custom images for an item
- Added tags to image urls
- Added proper image placeholder for images that can't be found