message: rtabmap.launch: added odom_sensor_sync argument for convenience
diff: <arg name="odom_tf_angular_variance" default="1"/> <!-- If TF is used to get odometry, this is the default angular variance -->
  <arg name="odom_tf_linear_variance" default="1"/> <!-- If TF is used to get odometry, this is the default linear variance -->
  <arg name="odom_args" default="$(arg rtabmap_args)"/>
  + <arg name="odom_sensor_sync" default="false"/>
  +
  <arg name="subscribe_user_data" default="false"/> <!-- user data synchronized subscription -->
  <arg name="user_data_topic" default="/user_data"/>
  <param name="ground_truth_base_frame_id" type="string" value="$(arg ground_truth_base_frame_id)"/>
  <param name="odom_tf_angular_variance" type="double" value="$(arg odom_tf_angular_variance)"/>
  <param name="odom_tf_linear_variance" type="double" value="$(arg odom_tf_linear_variance)"/>
  + <param name="odom_sensor_sync" type="bool" value="$(arg odom_sensor_sync)"/>
  <param name="wait_for_transform_duration" type="double" value="$(arg wait_for_transform)"/>
  <param name="database_path" type="string" value="$(arg database_path)"/>
  <param name="approx_sync" type="bool" value="$(arg approx_sync)"/>
  