Control/UAV/Ardupilot: Added function handler for raw (scaled) IMU data.
Config: uav/transports: Added AngularVelocity and MagneticField message to Transports.Logging and Transports.UDP.
Control/UAV/Ardupilot: Set to 50Hz the receiving rate of MAV_DATA_STREAM_RAW_SENSORS and replaced scaled_imu with raw_imu.
Config: uav/transports: Added Announce message to Transports.Loggigng.
Merge branch 'feature/ardupilot_raw_imu'

Feature #3158: IMU data is now extracted from the APM Ardupilot at 50
Hz. These data include Acceleration, AngularVelocity, and MagneticField.

Authored By: José Braga
Reviewed By: Maria Costa

This commit closes #3158.