Initial changes to break out AllApps into its own view.

- Moves launcher state-transition code into its own class
- Moves all-apps related code into a separate view/set of classes
- Implements a basic list view for all apps

Change-Id: I68f174aa9e1bf82c4e46ce9549c78a8dc4623f46

src/com/android/launcher3/PagedViewWithDraggableItems.java

@@ -109,7 +109,7 @@ public abstract class PagedViewWithDraggableItems extends PagedView
         // Return early if we are still animating the pages
         if (mNextPage != INVALID_PAGE) return false;
         // When we have exited all apps or are in transition, disregard long clicks
-        if (!mLauncher.isAllAppsVisible() ||
+        if (!mLauncher.isWidgetsViewVisible() ||
                 mLauncher.getWorkspace().isSwitchingState()) return false;
         // Return if global dragging is not enabled
         if (!mLauncher.isDraggingEnabled()) return false;