- Removes several older nodes and modules that are no longer used for our AV stack.
- Moves the run_challenge_test module to the utilities directory as this is more appropriate location for the module.

- Removes several of the older launch files that would no longer work.

- Renames the constants file to include the _module notation, to better represent the file type.

- Updates the constants module documentation.
- Adds a license file.

- Removes several unneeded files from the repository.
- Renames controller node file to match the name of the class within.
  - Updates launch file to use this new name.
- Renames possible_paths file to match pep8 standard.
  - Updates files to use this new module name.
- Moves visualization/testing script from root directory to utilities directory.

- Updates the file name of the MCity Challenge Runner program to match the program's name.

- Updates the client/server settings of the ROS AV stack to match what Michigan needs for their challenging vehicles to operate correctly.