refactor: standardize object type identification using uLibTypeMacro and update serialization macros

src/HEP/Geant/Scene.h

@@ -43,8 +43,7 @@ class EmitterPrimary;
 
 class Scene : public Object {
 public:
-
-  virtual const char* GetClassName() const override { return "Geant.Scene"; }
+  uLibTypeMacro(Scene, Object)
 
   Scene();
   ~Scene();