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post GtkActionable in action [{name Gergely Polonkai} {email}]

I have seen several people (including myself) struggling with disabling/enabling menu items, toolbar buttons and similar UI interfaces based on different conditions. It gets even worse if there are multiple representations of the same action in the same application, e.g. a menu item and a toolbar button exists for the same action. But with GTK+ 3.4, we have GtkAction, which is exactly for this kind of situations.