Allow UTF-8 console input

[ITaluone]

Original description

There is a problem for user wanting to input non-ascii characters (ex. cyrillic) during parameter prompt

All credits going to: @rus-art Thank you!

Taken from here: nuke-build/nuke#1321

[ChrisonSimtian]

generally lgtm, might be good to pull this into a IsValidInputKey() extension and put some unit tests around it

[dennisdoomen]

Can you extend the description a bit? What is it solving? Any chance for some test coverage?

[ITaluone]

I was just "backporting" a fix from the original repo, which I thought it would be useful*.

Like the original description says: It previously wasn't allowed to have e.g. cyrillic letters as console input.

Nothing more, nothing less :)

*) I think we should port over fixes propagated by other NUKE contributors to let them know about this one.

[ITaluone]

generally lgtm, might be good to pull this into a IsValidInputKey() extension and put some unit tests around it

On to it

[ChrisonSimtian]

can we dial this one back a bit, please? Im all for the interface and such but I think this should be a smaller PR just for the UTF support. We can introduce interfaces and refactor this later :-)
Just make it an extension and give it a simple unit test, we touch it up later ;-)
@ITaluone

[ITaluone]

Ok.. but I don't get it.. you asked for unit tests.. and these are the changes to do so?

Edit: done

[ChrisonSimtian]

way better :-) This way the blast radius is a bit smaller. And we hold off with the bigger refactoring a bit, I'm cooking something in behind the scenes that might make the refactoring obsolete ;-)