Undistortion matrices and calibration values should be in a separate .json file

[jamespilgrim]

We don't want folks to have to re-setup their undistortion and camera calibration values each time they do a git pull origin. Doing so can overwrite those values.

The undistortion matrices and calibration values should be in a separate .json file. Folks would like a behavior where the separate file is not in the repo, but you can create yours yourself, and then it can't get overwritten when you git pull origin. And if the file doesn't exist, some default undistortion matric in the main golf_sim_config.json file gets used instead.