Tested state changing

Game/src/MainState.cpp

@@ -1,6 +1,6 @@
 #include "MainState.h"
 
-void MainState::onEnter() {
+void MainState::onEnter(Application* app) {
 	Log("MainState update!");
 }
 

Game/src/include/MainState.h

@@ -3,7 +3,7 @@
 
 class MainState : public nf::IGamestate {
 public:
-	void onEnter() override;
+	void onEnter(Application* app) override;
 	void onExit() override;
 
 	void update() override;