[Development] Pattern for native properties on Qt Window System abstractions

[Jorgen Lind]

Hi,

I have a patch which is going nowhere:
https://codereview.qt-project.org/#change,75845

The problem with the patch is that it solves something which is allready 
doable today with dynamic properties and dynamic property change event.

The purpose of this patch is that a platform plugin can define a header 
containing enums which will work as a contract for native properties and flags 
which the platformplugin will handle. The application/library can then in a 
typesafe way set these properties on the window.

I'm ok with dropping the patch it that is the consensus, but as its now, its 
just laying around not getting any thumbs up or down.

Jørgen