Returns a list of all the keys for this settings instance.
        
        :return     [<str>, ..]

def allKeys(self):
        """
        Returns a list of all the keys for this settings instance.
        
        :return     [<str>, ..]
        """
        if self._customFormat:
            return self._customFormat.allKeys()
        else:
            return super(XSettings, self).allKeys()