Codechange: use std::sort() for all std::vector types

src/window_gui.h

@@ -192,6 +192,8 @@ struct WindowDesc : ZeroedMemoryAllocator {
 	static void LoadFromConfig();
 	static void SaveToConfig();
 
+	bool operator< (WindowDesc * const &other) const;
+
 private:
 	int16 default_width_trad;      ///< Preferred initial width of the window (pixels at 1x zoom).
 	int16 default_height_trad;     ///< Preferred initial height of the window (pixels at 1x zoom).