Toggle load by a short button press, enter menu with a long button press when in CC mode

Possible solution for issue #30
Right, that's what I expected. That's a bit too much overhead for one feature, IMO. I'll give some thought to whether there's a clever way to react as soon as the button's been held down for a set time, but I don't think it'd be the end of the world if it only reacts when the button is released.