Replace argument parser with something else

[agjohnson]

Currently, this is using the python argument parser, which handles some similar syntax to the argument list. There are two other ways we can address this however:

• Try to get autoapi arguments from env data first
• Fallback to parsing arguments out a bit more, as per the rules in https://msdn.microsoft.com/en-us/library/vstudio/fsbx0t7x(v=vs.140).aspx

If we assume that some folks might try to write argument lists by hand, and not rely on the autoapi, we should probably have a legitimate default to fall back to.