Improve macOS screen info reporting #75
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The current version of screeninfo (0.8.1) was not reporting the screen size in mm of my monitor on macOS Ventura:
This PR uses a different API on macOS to detect the monitor size in
mmandscale(which is 2 or 3 for retina displays). The size in mm is used to calculateppmmwhich can be converted toppifor use in applications that require conversions from pixels to real world measurement units.