[background image] On copy, put background image as image data on the clipboard #1797
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...but only if it's the only selected item.
This will not work in Safari over HTTP (ie. Fontra Pak), due to Safari not supporting the async clipboard API in that case. (To be clear, it does work in Safari when we run Fontra on HTTPS, but that's not the case with Fontra Pak.)
This fixes #1796.