Other implementations were unstable due to the use of random numbers.
This seems to be fast and also enables us to search specific parts
of an image. 16 colors are indexed (Material Design).
* First commit for color-improvements
* Use k-means for prominent color detection
* Remove debugging code
* Add color checks to tests
* Add additional test for color names
* Implement photoswipe
* - Make images fit correctly in lightbox mode
- Use photoswipe also for detail view
* Add responsive image resizing
* Clean up code
* Remove old viewer code
* Move lightbox to bottom
* Move images with sizes to computed properties
* Remove unnecessary formatting
