Review request: AppMenu support for KDE

[Alex Fiestas]

This is finally happening !	 I will try to rewrite the Runner shotly using 
the new api.

I overlooked at the code and I don't see any issues with it, I will do a 
deeper look later.

I find one problem though, not specially with kded-appmenu but also with the 
older implementation, the library only handles QMenu which is not ideal to use 
on QML or in threaded applications (like in the case of KRUnner).

We should provide a way of accessing more easily to the data (thinking on a 
model) and ideally would be awesome to have this before releasing.

Anyway, good work I'm really looking forward to this.