feat: scene + entity class

engine/src/scene/scene.cpp

@@ -2,10 +2,8 @@
 
 namespace Engine {
 
-Scene::Scene() = default;
-
-std::unique_ptr<Entity> Scene::CreateEntity() {
-    return std::unique_ptr<Entity>(new Entity(m_registry.create(), this));
+Entity Scene::CreateEntity() {
+    return { m_registry.create(), this };
 }
 
-} // namespace Engine
+}