Help with some terms and better documentation

[kchawla-pi]

Hi
Your library has been a boon to me. We are using it to easily control our uvc cameras.
Some of the terms are not well documented and I cannot find their explanations.
I was hoping you would enlighten me about some of them. Once I know, I can open a PR to add them to the docstring in your repo.

What is bandwidth_factor?
What is the Capture.refresh attribute? Is it camera model dependent?
What is the difference between get_frames and get_frames_robust?
What does the Control.refresh() do? I thought it will reset the camera setting to auto but it doesn't always happen.

If there is another forum where I can post these and more queries without cluttering the issue tracker, please point me to that.