Initial spring loaded workspace.

It is a bit clunky and doesn't have the App Info drag bar at the
bottom yet, but it is a start.

Also removed page hints because they are no longer used.

Change-Id: I1f8f82d33e6694cab1f1c762e78852ac0d40ab33

src/com/android/launcher3/allapps/AllAppsContainerView.java

@@ -477,8 +477,6 @@ public class AllAppsContainerView extends BaseContainerView implements DragSourc
 
         // Start the drag
         mLauncher.getWorkspace().beginDragShared(v, mIconLastTouchPos, this, false);
-        // Enter spring loaded mode
-        mLauncher.enterSpringLoadedDragMode();
 
         return false;
     }