[actuator] Prepare orientation for automatic documentation

while here, handle a style issue
[actuator] Improve the documentation of stabilized_quadrotor

ok to generate the doc from the python file.
[actuator] Improve steer_force documentation

While here, improve a bit the style, following PEP 008.
Ok'ed to generate the doc from it.
[actuator] Improve the documentation of the teleport actuator

Prepare it for doc autogeneration.
[actuator] Improve doc and style for v_omage_diff_drive

- Wrap long lines
- Add space where necessary, remove the unnecessary one.
- Document the different service, local_data, ...
- Ready for auto generation of the doc
[actuator] Add doc for gripper, ready for auto generation
[actuator] Improve documentation for light

Ready for autogeneration.
[actuator] Improve doc and style for mocap_control

- Wrap long lines
- Minor other PEP008 style fix
- Use add_data, _name to document the controller
[actuator] Waypoint style improvement (PEP008)
[sensor] Improve doc of accelerometer

While here, improve a bit the style
[sensor] Improve documentation of gps
[sensor] Improve documentation for gyroscope
[sensor] Improve documentation of imu