Revamp notifications for macOS and add support for actionable update notifications #4512
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Our current implementation of macOS notification support uses deprecated code that prevents us from meaningfully customising notifications and making them more interactive (and thus more useful).
This PR reimplements our notification support by using Apple's UserNotifications framework, which allows us a lot more flexibility with what we can do with notifications.
Thanks to this, this PR also implements support for interactive update notifications which, upon clicking, redirect the user to the download page for the desktop client when we are not using the Sparkle auto-updater.