NotificationRestrictions provides a simple mechanism to avoid disruptions
during full screen presentations or other use cases where the screensaver or
desktop notifcations are inappropriate.
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Using KNotificationRestrictions is quite straightforward: create an instance
of KNotificationRestrictions, passing in the set of or'd flags representing
the services that should be prevented from interrupting the user. When done
(for instance when the presentation is complete) simply delete the
KNotificationRes