modifying the drawer menus

[Kai Uwe Broulik]

‎> i just pushed the support of enabled.

Awesome. However, considering the future of QtQuick Controls 1 and the fact that QQC 2 don't have an "Action" we should probably provide our own simple QObject for this. Once we sort out the deployment, that is. There will most likely be additional properties in the future we'd like to have but then we cannot change the API anymore, such as "primary" action, or "pinned", or, well, a "visible" property.