Base: add Sleep Mode Flip Tile

Sleep Tile Flip into SleepMode Tile

Change-Id: I84b6e7125f4cc4eca58e576441442e94e5553dca
Base: Allow hiding notification icons

When long pressing a notification, add another menu
item which allows the user to hide the notification icon
(but keep the actual notification in the dropdown).

This is meant for applications which have services running
in the statusbar which the user is aware of, so right now
we hide the icon by the package.

Change-Id: Id319e1b14d0cf8957cc718fcc27bf0dcb394bc8f
Merge "Base: add Sleep Mode Flip Tile" into android-4.4
Merge remote-tracking branch 'cm/android-4.4' into android-4.4