ROS2 rosout logger

[Timple]

Instead of outputting to the terminal like the StdCoutLogger, it would be nice to output to rosout for ROS2.

But since this package isn't even ROS2, what would be the best way to go about this? Create a ros2 branch? Or create a new BehaviorTree.ROS2 repo?

(Note, this is a different request than #5).

[facontidavide]

I am going to create a ROS2 version soon

[Timple]

Awesome!

If there's a test-branch available somewhere, I'd be happy to evaluate!