* rename planning_ros_utils -> kr_planning_rviz_plugins
* remove both of the above from kr_autonomous flight (todo: add to external repos)
* move primitive_ros_utils (converts btw MPL and kr_planning_msgs) to the action_planner since it is only used there
* still todo: data_type.h (defines common datatypes like Vec3f) and data_ros_utils (random data conversions) should not live in kr_planning_rviz_plugins, and should be in some common location. data_type is also copied from mpl/jps. state_machine, action_trackers, and action_planner are the packages that use data_ros_utils

per @versatran01 's request