Add gain and white balance sliders

[asid61]

Is your feature request related to a problem? Please describe.
Gain and white balance are often set badly on cameras, adding noise and color inaccuracy

Describe the solution you'd like
Add sliders for gain and white balance under the other sliders. It can be an an "advanced features" tab or dropdown to make it harder to change my accident for new users.

Describe alternatives you've considered
Setting it over V4l2 works but sucks

Additional context