Show HN: Bounding box image-tagging server application

Similar to https://github.com/puzzledqs/BBox-Label-Tool but better for farming out huge quantities of tagging.

This tool outputs training sets in the YOLO format.

Admins can upload lists of image URLs (tested up to 10K), assign labelling tasks to worker and download when it's ready.

The admin UI provides a variety of convenience features to ensure the entire set is labelled correctly.