Wizards: Sort

Introduce new QString id() const-API and sort wizards by
[untranslated] category and id. Introduce respective constants.
Rubber-stamped-by: con <qtc-committer@nokia.com>

src/plugins/coreplugin/dialogs/newdialog.h

@@ -57,7 +57,7 @@ public:
     explicit NewDialog(QWidget *parent);
     virtual ~NewDialog();
 
-    void setWizards(const QList<IWizard*> wizards);
+    void setWizards(QList<IWizard*> wizards);
 
     Core::IWizard *showDialog();