Added a 'refreshrate' field to the table returned by love.window.getMode. The value may be 0 if the refresh rate of the monitor can't be determined. It might also be 59 instead of 60 on 59.94hz monitors on some operating systems.

src/modules/window/Window.h

@@ -59,6 +59,7 @@ public:
 		SETTING_DISPLAY,
 		SETTING_HIGHDPI,
 		SETTING_SRGB,
+		SETTING_REFRESHRATE,
 		SETTING_MAX_ENUM
 	};
 
@@ -198,6 +199,7 @@ struct WindowSettings
 	int display; // = 0
 	bool highdpi; // false
 	bool sRGB; // false
+	double refreshrate; // 0.0
 
 }; // WindowSettings