Portable High-level Agent Programming with golog++ Topics: Agent Platforms and Interoperability; Autonomous Systems; Cognitive Robotics; Hybrid Intelligent Systems; Knowledge Representation and Reasoning; Knowledge-Based Systems; Planning and Scheduling; Programming Environments and Languages; Robot and Multi-Robot Systems In Proceedings of the 13th International Conference on Agents and Artificial Intelligence - Volume 2: ICAART, 218-227, 2021