Add macOS support #53
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These are a lot of commits but until commit 06c0ef4 it is mostly cleaning up the code in preparation.
Most of the code can be shared, except for the
UIKitimports, which I conditionally replaced byCocoaimports on macOS. Image handling is slightly different, as theUI*classes are not available on macOS.Due to the initializer of
NSImageViewnot accepting an optionalNSImageI refrained from adding a convenience initializer accepting aQRCode, where it is unclear if an image could be constructed.I'm not sure if it breaks the Travis CI, Carthage, Cocoapods, etc setups. I would appreciate if someone can test that.