Don't call NewLevel during app ctor

src/NazaraEditor/Core/Application/BaseApplication.cpp

@@ -25,8 +25,6 @@ namespace Nz
 		Nz::Imgui::Instance()->Init(window);
 		ImGui::EnsureContextOnThisThread();
 
-		NewLevel();
-
 		AddUpdaterFunc(Interval{ Nz::Time::Milliseconds(16) }, [&](Nz::Time elapsed) {
 			if (!window.IsOpen())
 				return;

src/NazaraEditor/Editor/main.cpp

@@ -73,7 +73,5 @@ int WinMain(int argc, char* argv[])
 		.type(entt::type_hash<Nz::EditorNameComponent>::value())
 		.func<&Nz::ReflectComponent<Nz::EditorPropertyInspector<Nz::EditorRenderer>, Nz::EditorNameComponent>>(entt::hashed_string("Reflect"));
 
-	entt::handle entity = app.CreateEntity("TestEntity");
-
 	return app.Run();
 }