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This change makes viewing the generated HTML reports more efficient and user-friendly by not loading test images that are not yet in the viewport. This makes it far more practical to view large reports quickly and not have the page consume large amounts of bandwidth.
This change adds and uses react-visibility-sensor to handle the visibility detection. This is the library used on www.nytimes.com to lazily load images.
Note: please ignore the extra early commits in my PR from some earlier work. I assume this will get squash-merged so they won't matter.