refactor: migrate vtk classes to use ObjectWrapper for model management and update registration logic

src/Core/testing/CMakeLists.txt

@@ -3,6 +3,7 @@
 set( TESTS
         SmartVectorTest
         SmartPointerTest
+        ObjectWrapperTest
         VectorTest
         ObjectFlagsTest
         ObjectParametersTest

src/Core/testing/ObjectWrapperTest.cpp

@@ -0,0 +1,26 @@
+#include "Core/ObjectFactory.h"
+#include <iostream>
+
+struct NonDefault {
+    NonDefault(int) {}
+};
+
+struct Default {
+    Default() : value(42) {}
+    int value;
+};
+
+int main() {
+    std::cout << "Testing ObjectWrapper with Default Constructible type..." << std::endl;
+    uLib::ObjectWrapper<Default> w1;
+    
+    std::cout << "Testing ObjectWrapper with Non-Default Constructible type..." << std::endl;
+    NonDefault nd(10);
+    uLib::ObjectWrapper<NonDefault> w2(&nd);
+    
+    // The following would NOT compile without SFINAE:
+    // uLib::ObjectWrapper<NonDefault> w3; 
+
+    std::cout << "Tests passed (compilation and manual instantiation)!" << std::endl;
+    return 0;
+}