ui/cocoa: add option to swap Option and Command

ui/cocoa: add option to swap Option and Command

On Mac OS X the Option key maps to Alt and Command to Super/Meta. This change
swaps them around so that Alt is the key closer to the space bar and Meta/Super
is between Control and Alt, like on non-Mac keyboards.

It is a cocoa display option, disabled by default.

Acked-by: Markus Armbruster <[email protected]>
Signed-off-by: Gustavo Noronha Silva <[email protected]>
Message-Id: <20210713213200[email protected]>
Signed-off-by: Akihiko Odaki <[email protected]>
Message-Id: <20220306121119[email protected]>
Reviewed-by: Will Cohen <[email protected]>
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>