Move detail panel to its own thing

Move pieces of the detail panel from the header and QSPanel to be
in a single container to make the enter/exit be handled better
and code cleaner.

Change-Id: Id1e79b96830ee50051e340fb09ecde537a64e516
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
index 8f0f51f..88a7843 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
@@ -1975,7 +1975,7 @@
     }
 
     public boolean isQsDetailShowing() {
-        return mQsContainer.getQsPanel().isShowingDetail();
+        return mQsContainer.isShowingDetail();
     }
 
     public void closeQsDetail() {