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/LocalBluetoothPreferences.java

@@ -22,6 +22,9 @@ import android.content.SharedPreferences;
 import android.content.res.Configuration;
 import android.util.Log;
 
+import com.android.settingslib.bluetooth.LocalBluetoothAdapter;
+import com.android.settingslib.bluetooth.LocalBluetoothManager;
+
 /**
  * LocalBluetoothPreferences provides an interface to the preferences
  * related to Bluetooth.
@@ -60,7 +63,7 @@ final class LocalBluetoothPreferences {
 
     static boolean shouldShowDialogInForeground(Context context,
             String deviceAddress) {
-        LocalBluetoothManager manager = LocalBluetoothManager.getInstance(context);
+        LocalBluetoothManager manager = Utils.getLocalBtManager(context);
         if (manager == null) {
             if(DEBUG) Log.v(TAG, "manager == null - do not show dialog.");
             return false;