Thanks to @mwkroening (#317) and @martijnberger (#323) for helping fix this update.
* Update to glutin 0.22.0 and winit 0.20.0 release, removing alpha pinning
* scale_factor() replaces hidpi_factor()
* Listen for ScaleFactorChanged, separate from Resized event
* Fix getting physical size of window
* Fix logical mouse event coordinates