ROS2 Foxy support

[jmm-slamcore]

Given that the Boxer is based on the OTTO 100 base which is actually using ROS2, are there any plans to update these packages' launch files and configs to ROS2?

[civerachb-cpr]

Because the Otto 100 already publishes most of the necessary topics through its ROS 2 API, many of the packages in this repo may actually be redundant. We're currently planning how to best to support Boxer as a purely ROS 2 platform, but may rely more heavily on Otto Motors' OTTO 100 API directly rather than providing a middleware set of packages.