+ ParamCachingIPKContainer::GetConfig() would first acquire-unique m_lock, then via UserDefinedIPKContainer::AddConfig() (inheritance) would try to acquire UserDefinedIPKManager::mutex
+ in another thread UserDefinedIPKManager::AddUserDefined() would first acquire-unique UDIM::mutex, then via UDIC::AddUserDefined() would try to acquire m_lock
+ now, UDIM::AddUserDefined() won't hold UDIM::mutex when accessing UDIC
+ also, removed Lock() and Release() methods which were a violation of RAII