Moving all apps code into sub package.

- Renaming resources, dimens, etc to be more consistent
- Removing old AppsCustomize resources and other unused code

Change-Id: I15ce35e7cb7a9b9344fc7103963e4e4c9e45d89a

src/com/android/launcher3/WidgetPreviewLoader.java

@@ -25,7 +25,6 @@ import android.graphics.drawable.BitmapDrawable;
 import android.graphics.drawable.Drawable;
 import android.os.AsyncTask;
 import android.os.Handler;
-import android.os.Process;
 import android.util.Log;
 import android.util.LongSparseArray;
 import com.android.launcher3.compat.AppWidgetManagerCompat;
@@ -34,7 +33,6 @@ import com.android.launcher3.compat.UserManagerCompat;
 import com.android.launcher3.util.ComponentKey;
 import com.android.launcher3.util.Thunk;
 import com.android.launcher3.widget.WidgetCell;
-import junit.framework.Assert;
 
 import java.util.ArrayList;
 import java.util.Collections;