Suggestion to implement water_detection_safety. TODO Edit thrust_constraint and torque_constraint from struct

[JannickBlmndl]

…nstraint and from velocity_constraint

Make use of water detection sensor for safety to limit the thruster when on/under water.
Add uOrb topic:
#include <uORB/topics/water_detection.h>
functions

constrain_actuator_commands() // constrains and publish the thrust and the attitude setpoint
apply_water_safety()  // Limit pitch, roll, yaw and thust xyz if water is detected

Let PID_Output call

constrain_actuator_commands(X_Axis.pid_output, Y_Axis.pid_output, Z_Axis.pid_output, Roll_Axis.pid_output, Pitch_Axis.pid_output, Yaw_Axis.pid_output);

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