Key Updates
- Add BlueBoat with sonar, waves, and SRTM terrain to Gazebo Sim
- Removed fake sonar data publisher; Gazebo Sim publishes this data now
- Add support for using non-stationary kernel functions
- Add method to save kernel params in data visualizer
- Improve ApproxTimeSync with sync on arrival time for sensor data
- Switch path follower to use mavros_control package
- Improve two-way sync for updating paths during online missions