Propagate the refactor in Step 10 MathFunctions through all of the steps. Use MathFunctions/MathFunctions.cxx instead of Tutorial.cxx to determine which sqrt library is called. Adds .h files which correspond to their .cxx files by name.
Run the `clang-format.bash` script to update our C and C++ code to a new include order `.clang-format`. Use `clang-format` version 6.0.