Let's schedule WinAPI ASCII functions for deprecation!

[Martin Nowak]

> * it performs worse because Windows has to convert ASCII string to  
> UTF-16 first
Is that a fact?

> P.S.
> Let's finally solve encoding problems that should be solved 10 years  
> ago! By the way, Git+TurtoiseGit still has encoding problems on Windows  
> and it is awful (see its changelog).
>

Given that it only requires a 'w' suffix for literals it's a good choice.