Merge branch 'qt_menubar' of https://github.com/GeoTeric/wxWidgets

Improve radio menu items support in wxQt and make the menu unit tests
pass for it, although some of them had to be disabled.

See https://github.com/wxWidgets/wxWidgets/pull/1030

include/wx/qt/menu.h

@@ -44,6 +44,7 @@ public:
     virtual wxMenu *Remove(size_t pos);
 
     virtual void EnableTop(size_t pos, bool enable);
+    virtual bool IsEnabledTop(size_t pos) const wxOVERRIDE;
 
     virtual void SetMenuLabel(size_t pos, const wxString& label);
     virtual wxString GetMenuLabel(size_t pos) const;