Implement BT settings functionality for new UI.

- Removed context menu logic for long press (no longer used).
- Converted device picker to run in its own Activity, using a dialog
  theme on large screen devices and full-screen on phones.
- Removed unused resources.
- Add device to "Paired devices" list when pairing is initiated by the
  remote device.
- Return to Bluetooth settings pane after successfully pairing a new
  device from the "Find nearby device" pane.
- Add support for renaming devices (TODO: persist the custom name and
  update the "bread crumb" in the action bar to the new device name).
- Add support for incoming file transfer and auto connect checkboxes
  in DeviceProfilesSettings.
- Show available and connected device profiles as icons instead of
  summary text. Available but disconnected profiles are drawn in gray.
- Fixed bluetooth_notif_message to include the device name as a parameter
  instead of appending the name to the end of the localized string.
- Changed some fields from private to package scope for more efficient
  access from inner classes.

Bug: 3137982

Change-Id: Ic2d6ee5be60c9c5b3f3a8a58846d58efedfa5c93

src/com/android/settings/bluetooth/BluetoothPairingRequest.java

@@ -85,12 +85,13 @@ public class BluetoothPairingRequest extends BroadcastReceiver {
 
                 String name = intent.getStringExtra(BluetoothDevice.EXTRA_NAME);
                 if (TextUtils.isEmpty(name)) {
-                    name = device.getName();
+                    name = (device != null ? device.getName() :
+                            context.getString(android.R.string.unknownName));
                 }
 
                 notification.setLatestEventInfo(context,
                         res.getString(R.string.bluetooth_notif_title),
-                        res.getString(R.string.bluetooth_notif_message) + name,
+                        res.getString(R.string.bluetooth_notif_message, name),
                         pending);
                 notification.flags |= Notification.FLAG_AUTO_CANCEL;
                 notification.defaults |= Notification.DEFAULT_SOUND;