This function creates a 'ParameterValue' from JSON.
References ug::bridge::Registry::classname_registered(), ug::bridge::ExportedConstructor::create(), ug::bridge::Registry::get_class(), ug::bridge::IExportedClass::get_delete_function(), ug::bridge::ExportedClassBaseImpl::get_json_constructor(), ug::bridge::GetUGRegistry(), make_sp(), ug::bridge::ParameterStack::push(), type(), and UG_LOG.
Referenced by ug::JSONToolkit::JSONTool::create_object(), and ug::JSONToolkit::ParameterSet::loadFromJSONObject().