Support more of CPython's command-line options

[Kodiologist]

It could be useful for the hy executable to support more of CPython's command-line options. A few that we might want to support are -b, -B, -E, -O, and -S.

[waigx]

This sounds a good idea. I am going to grab -E supporting.

[vodik]

Oooh, reviewing -E made me think of something.

@Kodiologist might want to test how case insensitive the mangler is: https://docs.python.org/3.2/using/cmdline.html#envvar-PYTHONCASEOK

[Kodiologist]

But then I'd have to run icky proprietary software.

[waigx]

I am honestly not familiar with PYTHONCASEOK... How does this effect the project? and why is icky related?

[refi64]

Because it only has an effect on Windows and macOS, which are "icky" proprietary systems...

[waigx]

@kirbyfan64 haha gotcha