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/DeviceProfile.java

@@ -122,6 +122,8 @@ public class DeviceProfile {
     int hotseatAllAppsRank;
     int allAppsNumRows;
     int allAppsNumCols;
+    // TODO(winsonc): to be used with the grid layout
+    int allAppsRowsSize;
     int searchBarSpaceWidthPx;
     int searchBarSpaceHeightPx;
     int pageIndicatorHeightPx;