Move isolatable bluetooth code to SettingsLib

Move the non-ui bluetooth control/tracking code to SettingsLib so
that it can be shared with others.

Mostly just move classes to frameworks/base/packages/SettingsLib,
however a few things had to move around.
 - Dock handling had to move back to code still in settings
 - Local preference related code had to be moved back to settings
 - Added an error flow from SettingsLib to Settings

Depends on I69fd888362c6dbb325f6113b32c4b15cc6a23a41
Bug: 19180466
Change-Id: Ie57fe26a27bbb0adc2ef69e042a05c7290c6a52a

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

@@ -43,6 +43,9 @@ import android.widget.TextView;
 import com.android.internal.app.AlertActivity;
 import com.android.internal.app.AlertController;
 import com.android.settings.R;
+import com.android.settingslib.bluetooth.CachedBluetoothDeviceManager;
+import com.android.settingslib.bluetooth.LocalBluetoothManager;
+
 import android.view.KeyEvent;
 
 import java.util.Locale;
@@ -103,7 +106,7 @@ public final class BluetoothPairingDialog extends AlertActivity implements
             return;
         }
 
-        mBluetoothManager = LocalBluetoothManager.getInstance(this);
+        mBluetoothManager = Utils.getLocalBtManager(this);
         if (mBluetoothManager == null) {
             Log.e(TAG, "Error: BluetoothAdapter not supported by system");
             finish();