Sebastian Scherer

Implement a more realistic sonar sensor simulation

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We currently abuse Gazebo's laser sensors and call it sonar. A more realistic simulation of sonar sensors ([side-scan sonar](https://en.wikipedia.org/wiki/Side-scan_sonar) and [multibeam sonar](https://en.wikipedia.org/wiki/Multibeam_echosounder)) would add much value to uuv_simulator and make...