Reuse identical iOS icons #90
Description
Currently the iOS icon generation produces identical icons with different filenames. For example iphone-20@2x.png and iphone-40@1x.png are both 40x40 pixel PNGs of the same icon. These could be the same icon file, e.g. 40.png, which is then just referenced multiple times in Contents.json.
Probably wont affect the actual installation sizes, as XCode / App Store likely optimizes per device bundles. But will at least decrease the icon generation time and size on disk.