Send additional data to Subscribe() listeners in Verse

wrap_subscribe.verse

#usage example (when subscribing to an event that returns an agent)
ButtonDevice.InteractedWithEvent.SubscribeAgent(OnButtonInteract, "Hello!")

OnButtonInteract(Agent : agent, Text : string) : void =
    Print("Button interacted with {Text}!")
	
#usage example (when subscribing to an event that returns tuple(), aka an empty tuple)
CampfireDevice.CampfirePulseEvent.SubscribeEmpty(OnCampfirePulse, 90210)

OnCampfirePulse(Number : int) : void =
    Print("Campfire pulse had {Number}!")

#put this stuff somewhere in one of your verse files, perhaps utils.verse or something!
(Listenable : listenable(agent)).SubscribeAgent(OutputFunc : tuple(agent, t)->void, ExtraData : t where t:type) : cancelable =
    Wrapper := wrapper_agent(t){ExtraData := ExtraData, OutputFunc := OutputFunc}
    Listenable.Subscribe(Wrapper.InputFunc)

wrapper_agent(t : type) := class():
    ExtraData : t;
    OutputFunc : tuple(agent, t) -> void
    InputFunc(Agent : agent):void = OutputFunc(Agent, ExtraData)

(Listenable : listenable(tuple())).SubscribeEmpty(OutputFunc : t -> void, ExtraData : t where t:type) : cancelable =
    Wrapper := wrapper_empty(t) {ExtraData := ExtraData, OutputFunc := OutputFunc}
    Listenable.Subscribe(Wrapper.InputFunc)

wrapper_empty(t : type) := class():
    ExtraData : t;
    OutputFunc : t -> void
    InputFunc():void = OutputFunc(ExtraData)