Require Pillow, and remove support for PIL.
Review Request #11336 — Created Dec. 16, 2020 and submitted — Latest diff uploaded
PIL is ancient and no longer worth supporting. Django and other
applications expect Pillow these days, and recent changes in Djblets
also require some internals from Pillow (for checking on registered file
types).This switches our dependency entirely over to Pillow. Users may need to
uninstall PIL.
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