[0.66] Backport a few of 10.15+ changes to 0.66 stable #1030
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This is a cherry-pick of 5 changes from main to 0.66-stable, mostly related to bumping our min OS to 10.15:
#938 - Remove some pre 10.15 @Availability checks
#924 - Use NSSwitch
#1028 - Fix some main thread checker violations in DynamicColorMacOS
#1029 - Replace currentAppearance with currentDrawingAppearance on macOS 11+
And I manually added:
#1012 - Only call +[NSAppearance currentAppearance] on the main thread
I had to manually recreate 1012 because it wasn't squashed when merged.