better structure QGB CLI flags

[rach-id]

Closes #302

[rach-id]

@evan-forbes Parsing the flags in this file is a bit repetitive. However, I couldn't find a way to better structure them.
Please let me know if you have an idea on how to do it better.

[codecov-commenter]

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[evan-forbes]

I think this makes sense. There are worse ways of organizing it, and while being brutally simple might not be able to serve our needs in the future, it certainly does now, along with sticking to the "pattern" that is already there!