Fixed 'scale to fit' functionality of WidgetImage

Widgets/WidgetImage.h

@@ -42,6 +42,11 @@ public:
 	virtual void draw() override;
 
 	static std::unique_ptr<Widget> builder(const nlohmann::json& j);
+
+protected:
+	// Create a new surface of the image_surface that is scaled via RESIZE_FIT method
+	// NOTE: The user MUST free the surface when done with it
+	SDL_Surface* image_scale_fit();
 };
 
 #endif // WIDGET_IMAGE_H_