[Suggestion] warn the player before aborting craft conversion

[Finnik]

Hey!
Could be a rare case, but when I was analyzing code I noticed, that when you `void Production::startItem(Base * b, SavedGame * g, const Mod *m) const` and your project require the craft, it would be removed and deleted. But when we look to `refundItem`, we can see that there is no way to refund the craft in case we abort construction.

I understand how coplicated proper handling of this case, you can stuck with no free hangar space. But may be at least warn the player about consequences?

[Meridian]

Sounds good.

Wanna PR it?

[Finnik]

Sure! 

[Finnik]

I've tried to make some generic solution like `ErrorMessageState`, but can't see the way to implement it - I need to stop running the code in btnStop method and ask for confirmation.
I can't see any examples of that - all confirmation states hold the custom logic of confirmed action. I can't see an example of something like callbacks to parent state.
Should it be done in a form of custom state with own special logic, or is there some smart way to solve the problem with a general state?

[Meridian]

I don't see any need for a generic confirmation window

typical example:
parent: TransferItemsState
confirm: TransferConfirmState