DigitalAppWidgetProvider is receiver for actions

Bug: 8239532
Bug: 10695465

DigitalWidgetViewsFactory lifespan was not unlimited, so using
it to receive actions was inappropriate. Moved all handling into
DigitalAppWidgetProvider. This change lost some of the optimizations
that DigitalWidgetViewsFactory had.

Replaced previous Utils.ACTION_ON_QUARTER_HOUR users with code that uses postDelayed

Change-Id: I27a7b96f8ab85f8f72c7e1b75d55a9616c3db859
(cherry picked from commit 3bb9d29c)