Command line argument parsing

Development
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Do also consider CLI11, this is much closer to the same behaviour as argparse and allows really complex inputs (if needed). It is also available as a single header. The license looks to be similar to the old VTK license, so there is probably no issues there.
It is very easy to use e.g.

// ...
  // Initialise the ArgParameters
  ArgParameters ap{true, 3, -45};

  CLI::App app{GetProgramName(argv[0]) +
               " - testing positional command line options"};
  bool r = false;
  app.add_flag("-r, --radians", r, "Use radians");
  app.add_option("angle", ap.angle, "The angle", true);
  app.add_option("dp", ap.dp, "The decimal precision", true);

  CLI11_PARSE(app, argc, argv);

  ap.degrees &= !r;
// ...
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