Release to ROS2

[IanTheEngineer]

This issue is to request a ROS2 release of Orocos BFL. It seems that bfl does not have ROS dependencies, and could hopefully be released as-is into the ROS2 buildfarm. For what it's worth, I've added some potentially useful links below:

BFL on Github:
BFL has migrated to Github - http://www.orocos.org/orocos/bfl-moved-github
current version 0.8.99 - https://github.com/toeklk/orocos-bayesian-filtering

ros2 Bloom:
ros2 bloom instructions: https://github.com/ros2/ros2/wiki/Releasing-a-ROS-2-package-with-bloom
ros2-gbp: https://github.com/ros2-gbp
rosdistro for ros2: https://github.com/ros2/rosdistro