HV-905 Providing a global config for auto unwrapping

An early attempt. Any thoughts on the direction?
> To me, all what counts is to create an API with clear and consistent semantics. 

Mine as well.

> There is no problem with it, and I didn't mean that @UnwrapValidatedValue should be required. On the contrary, I'd enable implicit unwrapping for both the cases once the global flag has been set, as an unwrapper exists in both cases.

If the global flag is set, `IntegerProperty` would indeed be validated. We are talking about the case where the falg is `false`.