April Tag OpenCV update compatibility fix

The River Labs April Tag ROS library causes the recently updated OpenCV library to crash. We forked the River labs version to BCLab-UNM/apriltags_ros and patched the problem.

The SwarmBaseCode has been updated to use the fixed BCLab-UNM submodule.

Instructions for updating the newest AprilTags submodule are:

Assuming you set up the swarm base code as a remote as described in the swarm base code readme, execute the following command:

git pull SwarmBaseCode

Then update the AprilTag submodule:

git submodule sync — src/apriltags_ros
git submodule update —remote src/apriltags_ros