Emin/feat: depth control via cmd vel #120
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Evasively closes #115
This PR connects cmd_vel.linear.z messages to cmd_pose.linear.z messages by integration of velocity commands over time and adding them up to cmd_pose, just like in #99
Also, since this is a very small PR, and this second change is also about depth control, I changed the inital target_depth value to -0.4 from 0.0. This will prevent the robot to try to ruah all the way up the moment we enable the controllers. Trust me, -0.4 is a carefully fine-tuned value! :)