Ambiguous `EditLabel` constructor in Msg type in Machine.elm

[Necried]

In the current codebase we have EditLabel StateID String, which suggests that the Machine type provides an interface for entering an edit state when a StateID is selected. However, the way its used in Building.elm disobeys this assumption, as the ID can be both a StateID and TransitionID:

finsm/src/Building.elm

Lines 347 to 360 in 398f02c

	EditLabel _ lbl ->
	let
	newState =
	case model.machineState of
	EditingStateLabel st _ ->
	EditingStateLabel st lbl
	EditingTransitionLabel tr _ ->
	EditingTransitionLabel tr lbl
	_ ->
	model.machineState
	in
	( ( { model | machineState = newState }, pModel, sModel ), False, Cmd.none )

In fact, it just ignores the ID and instead checks the state of the machine. In npda-v3, I refactored this into EditStateLabel and EditTransitionLabel, which then has a one-to-one relationship to EditingStateLabel and EditingTransitionLabel respectively.