Changes
- Improve how to get autopilot info in backend MAVROS
- Add simulated laser scanner to component snippets
- Add PID and PosePID libraries
- Add reference pose publisher
- Fix some Ardupilot issues in backend MAVROS
- Update configure.py to autoinstall some dependencies
- Support newest PX4 SITL versions from v1.10.0
- Stop supporting PX4 SITL versions prior to v1.10.0
- Tested in Ubuntu 18.04 and ROS Melodic