[Development] Use of std::function in Qt API

[Marc Mutz]

On 2017-04-25 16:34, Lars Knoll wrote:
[...]
> But I agree with Thiago, that we should have this written down in a
> QUIP, ideally with a list of the classes we consider ok to use in our
> APIs.
[...]

I'd make the QUIP define the updated BC guarantee. The list of std types 
available for use in Qt APIs should be in QtBase Git, though, to be 
versioned on a per-branch basis.