Add kitti label reader and dataset writer

This merge request adds a reader for kitti object detection labels (and predictions) that can be used in combination with LidarKITTIDataSetReader in order to visualize results of models trained on KITTI

It also adds a LidarKITTIDataSetWriter that exports A point cloud in KITTI binary format.

It's implemented as a filter for the moment because I haven't found the right way to implement it as a writer, so I'm open to any suggestion or any pointer to an example of a writer that would write 1 file by frame.

This MR also fixes small issues in BoundingBoxReader and LidarKITTIDatasetReader and moves dataset related readers/writers to a separate plugin

@nicolas.cadart @jerome.dias please have a look