Enable an effect in the KezMenu.

def enableEffect(self, name, **kwargs):
        """Enable an effect in the KezMenu."""
        if name not in VALID_EFFECTS:
            raise KeyError("KezMenu doesn't know an effect of type %s" % name)
        self.__getattribute__(
            '_effectinit_{}'.format(name.replace("-", "_"))
        )(name, **kwargs)