Move LauncherApplication's state and code to LauncherAppState.

This removes Launcher's static data and other state out of
the Application object. Now LauncherApplication (extends
Application) exists only to instantiate LauncherAppState.

Change-Id: I4e323bd78b77536b92054105536a55c0c2c19ba8

src/com/android/launcher3/DeleteDropTarget.java

@@ -82,7 +82,7 @@ public class DeleteDropTarget extends ButtonDropTarget {
         // Remove the text in the Phone UI in landscape
         int orientation = getResources().getConfiguration().orientation;
         if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
-            if (!LauncherApplication.isScreenLarge()) {
+            if (!LauncherAppState.isScreenLarge()) {
                 setText("");
             }
         }