[Development] 5.7 new features and 5.6 changelog

[Knoll Lars]

Hi everybody,

It would be great if those of you who haven’t done so yet fill in the 5.7 new features page on the wiki (https://wiki.qt.io/New_Features_in_Qt_5.7), so that we can get a good overview over the bigger new features in 5.7.

In addition, I’d like to ask every maintainer to have a look at the 5.6 changelog files, and checks that everything ok and the changelog is complete for your area.

Thanks,
Lars