refactor: unify Object signal system, update property connections, and integrate Eigen3 into Root module

src/Vtk/uLibVtkInterface.cxx

@@ -291,7 +291,7 @@ public:
 Prop3D::Prop3D() : Object(), pd(new Prop3DData(this)) { 
     ULIB_ACTIVATE_DISPLAY_PROPERTIES;
     for (auto* p : this->GetDisplayProperties()) {
-        uLib::Object::connect(p, &uLib::PropertyBase::Updated, this, &Prop3D::Update);
+        uLib::Object::connect(p, &uLib::Object::Updated, this, &Prop3D::Update);
     }
 }