Make notifications app list use new manage apps

The designs for Settings have the notification app list using the
same UI as the Manage Apps list, so switch the notification app
list over to the ManageApplications fragment.  This involves
adding some notification based filters and connecting the data
from the Notification Backend to ApplicationsState.

Bug: 19443900
Change-Id: I5e5cdb16890d536613ee59292b89a89b6fb9e2e6