Finish lecture 82: Implement the World class

Signed-off-by: Daniel Henry <iamdanhenry@gmail.com>

LightYearsEngine/include/framework/Application.h

@@ -0,0 +1,34 @@
+#pragma once
+#include <SFML/Graphics.hpp>
+#include "framework/Core.h"
+
+namespace ly {
+
+	class World;
+	class Application {
+	public:
+		Application();
+		void Run();
+
+		template<typename WorldType>
+		weak<World> LoadWorld() {
+			shared<WorldType> newWorld{ new WorldType{this} };
+			currentWorld = newWorld;
+			currentWorld->BeginPlayInternal();
+			return newWorld;
+		}
+	private:
+		void TickInternal(float deltaTime);
+		void RenderInternal();	
+
+		virtual void Render();
+		virtual void Tick(float deltaTime);
+
+		sf::RenderWindow mWindow;
+		float mTargetFrameRate;
+		sf::Clock mTickClock;
+
+		shared<World> currentWorld;
+	};
+
+}