Implement new volume UI design.

- Add segmented zen-mode picker to the rocker UI.
- Add a new "no interruptions" value to the zen setting.
- Implement expandable condition subpanel on the rocker UI.
- Remove the old circle&slash icons.
- Suppress alarm sounds if in "no interruptions" mode.
- Add warning re: alarms to the condition UI.
- Allow rocker UI to display over the keyguard.
- Remove Notifications QS tile.
- Realign volume rocker to the top of the screen.
- Add support for new "days" sleepMode.
- New icon policy rules for "volume" slot.
- New important icon (star).

Associated Settings change:
  I6ed56791784968adfbd684f490dbbebed285a2dd

Bug:15831713
Change-Id: I35afe38646f04d2ba0dbac11c2c6356120a33694