Injects functions after the deactivation routine of child classes got called
        :return: None

def _post_deactivate_injection(self):
        """
        Injects functions after the deactivation routine of child classes got called
        :return: None
        """
        # Lets be sure that active is really set to false.
        self.active = False
        self.app.signals.send("plugin_deactivate_post", self)
        # After all receivers are handled. We start to clean up signals and receivers of this plugin
        # Attention: This signal clean must not be called via a signal (like in other patterns),
        # because the call order of receivers is not clear and a signal/receiver clean up would prohibit the call
        # of all "later" receivers.
        self.signals.deactivate_plugin_signals()