def enable(self, **kwargs):
        super(Accrual, self).enable()
        self.machine.events.remove_handler(self.hit)  # prevents multiples

        for entry_num in range(len(self.config['events'])):
            for event in self.config['events'][entry_num]:
                self.handler_keys.add(
                    self.machine.events.add_handler(event, self.hit,
                                                    step=entry_num))
Enables this accrual. Automatically called when one of the
dataset/ETHPy150Open missionpinball/mpf/mpf/system/logic_blocks.py/Accrual.enable