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

src/Vtk/Math/vtkAssembly.h

@@ -36,7 +36,7 @@ class vtkObjectsContext; // forward
  */
 class Assembly : public Puppet {
 public:
-    virtual const char *GetClassName() const override { return "Vtk.Assembly"; }
+    uLibTypeMacro(Assembly, Puppet)
 
     Assembly(uLib::Assembly *content);
     virtual ~Assembly();

src/Vtk/vtkObjectsContext.h

@@ -15,7 +15,7 @@ namespace Vtk {
  */
 class vtkObjectsContext : public Puppet {
 public:
-  virtual const char* GetClassName() const override { return "vtkObjectsContext"; }
+  uLibTypeMacro(vtkObjectsContext, Puppet)
   vtkObjectsContext(uLib::ObjectsContext *context);
   virtual ~vtkObjectsContext();