Switch to recyclerview in ManageApplications

- Replace ListView with RecyclerView in layout
- Replace ApplicationAdapter's superclass to be RecyclerView.Adapter
- Change adapter interfaces (where necessary) to work with RecyclerView
- Replace fast scroll with Recycler's mechanism (all in xml)
- Removed section indexer (text bubble when fast scroll) because
  recyclerview doesn't support it.

Bug: 64804294
Test: robotests
Change-Id: I55b221836ce6abdeddf4568c8a8a5632cbddbd3b

src/com/android/settings/development/AppPicker.java

@@ -32,7 +32,6 @@ import android.widget.ArrayAdapter;
 import android.widget.ListView;
 
 import com.android.settings.R;
-import com.android.settings.applications.manageapplications.AppViewHolder;
 
 import java.text.Collator;
 import java.util.ArrayList;