LeoRover adapter for common topics

This simple node:

• merges /imu/accel and /imu/gyro (geometry_msgs/Vector3Stamped) in /leo_imu/data_raw (sensor_msgs/Imu)
• merges /wheel_odom (geometry_msgs/TwistStamped) and /wheel_pose (geometry_msgs/PoseStamped) in /leo_odom (nav_msgs/Odometry)
• converts /imu/mag (geometry_msgs/Vector3Stamped ) in /leo_imu/mag (sensor_msgs/MagneticField)

Note on Odometry

Firmware 1.2.0 has a bug that will prevent this node to merge topics under /leo_odom.

See this issue.

The solution is described in the issue itself: you have to recompile and flash the firmware by adding the missing code line.