Pull NotificationAccessSettings out into a reusable base class
and reuse all of it for a new condition providers settings page.
As with notification listeners, the entire section is hidden if
no apps provide conditions.
Change-Id: Ib5273f3362e392d99647347c23a514e4590f7ac9
General section:
Create switches for Phone calls & Messages. Contact
filtering disabled for now.
Automatic section:
Add mode switching based on a simple overnight schedule.
Bug:14211946
Change-Id: Ibb4e916cd5c9970f483858db91d6165507ceeb1a
