void Start()
{
prefs.OnPrefenceChanged += Test;
prefs.AddPreference(TEST_PREF, 1);
Debug.Log(prefs.GetPreferenceValue(TEST_PREF));
prefs.Save(PreferenceManager.FileType.XML);
prefs.DeleteAll();
prefs.Load("Preferences.xml", PreferenceManager.FileType.XML);
Debug.Log(prefs.GetPreferenceValue(TEST_PREF));
}