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
diff --git a/res/layout-sw720dp/launcher.xml b/res/layout-sw720dp/launcher.xml
index 960ccf3..a3d502c 100644
--- a/res/layout-sw720dp/launcher.xml
+++ b/res/layout-sw720dp/launcher.xml
@@ -71,6 +71,12 @@
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:visibility="invisible" />
+
+        <include layout="@layout/apps_view"
+            android:id="@+id/apps_view"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:visibility="invisible" />
     </com.android.launcher3.DragLayer>
 
     <ViewStub