Merge changes Iac617598,I59fe4951,I374dc97a,Id882cff6,Ie3b4c571, ... into sc-v2-dev

* changes:
  [Status Bar Refactor] Combine PanelExpansionChange and PanelExpansionStateChange into one listener class.
  [Status Bar Refactor] Remove PanelBar#onPanelPeeked and put its code in a callback instead.
  [Status Bar Refactor] Move a bunch of callbacks out of PanelBar and into (N)PVC.
  [Status Bar Refactor] Move PanelBar's touch handling into NotificationPanelViewController.
  [Status Bar Refactor] Remove unnecessary return value from StatusBar#interceptTouchEvent.
  [Status Bar Refactor] Move PanelBar#collapsePanel into NotificationPanelViewController.