Refactor scene objects initialization to call OnAwake before all OnStart

#520

Source/Engine/Level/Actors/Spline.cpp

@@ -514,10 +514,10 @@ void Spline::OnTransformChanged()
     BoundingSphere::FromBox(_box, _sphere);
 }
 
-void Spline::PostLoad()
+void Spline::Initialize()
 {
     // Base
-    Actor::PostLoad();
+    Actor::Initialize();
 
     auto& keyframes = Curve.GetKeyframes();
     const int32 count = keyframes.Count();

Source/Engine/Level/Actors/Spline.h

@@ -373,7 +373,7 @@ public:
     void OnDebugDrawSelected() override;
 #endif
     void OnTransformChanged() override;
-    void PostLoad() override;
+    void Initialize() override;
     void Serialize(SerializeStream& stream, const void* otherObj) override;
     void Deserialize(DeserializeStream& stream, ISerializeModifier* modifier) override;
 };