Embedded listpreference switch: a toggle switch that can also be clicked to enter a new fragment

 This is a generic list preference switch/toggle that accepts some settings constant and can also be
 used to enter a new preference fragment.  Call from XML resource:

   <com.android.settings.EmbeddedListPreferenceSwitch
		android:key="some_setting"
		android:fragment="com.android.settings.somefragment"
		android:title="@string/some_title"
		android:widgetLayout="@layout/listview_embedded_switchpreference" />