[TIMOB-19435] Android: Change Preference Activity to Preference Fragment

   <?xml version="1.0" encoding="utf-8"?>
   <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" android:title="TITLE">
       <CheckBoxPreference
           android:key="key1"
           android:title="this is key 1"
           android:summary="key 1 summary"
           android:defaultValue="false" />
       <CheckBoxPreference
           android:key="key2"
           android:title="this is key 2"
           android:summary="key 2 summary"
           android:defaultValue="false" />
   </PreferenceScreen>
   

   Ti.UI.Android.openPreferences();