[Development] Qt 5.8.0 change files. MAINTAINERS: your actions needed

[Jani Heikkinen]

Hi,

We did initial change files for Qt 5.8.0 (for those modules where missing), see https://codereview.qt-project.org/#/q/message:%22Add+changes+file+for+5.8.0%22,n,z

Maintainers, please take those over & finalize as soon as possible. And of course make sure those will be reviewed soon as well. We need to get all these in now, RC is planned to happen 13th Dec!

br,
Jani