Settings/Preferences rework

[litetex]

Checklist

• I checked, but didn't find any duplicates (open OR closed) of this issue in the repo.
• I have read the contribution guidelines given at https://github.com/TeamNewPipe/NewPipe/blob/HEAD/.github/CONTRIBUTING.md.
• This issue contains only one feature request. I will open one issue for every feature I want to request.

What feature do you want?

The settings should be reworked/regrouped.

The following should be reworked (IMO):

• Video and Audio:
  • Contains many player settings. Maybe add a "Player area" instead?
  • Behavior should get it's own settings area.
• Appearance: Maybe introduce groups of settings like currently in video and audio ("Theme")?
• Content:
  • Can be divided into:
    • language/country settings
    • "Services" (YT: Age restricted content, PeerTube: instances)
    • "Video details/data" (show comments, show next/similar videos, show description)
    • Import/Export (maybe own area)
  • Extract Feed into it's own area (also consider UI-Redesign #7047)
• Other stuff that may got introduced in the meantime (like New streams notifications #2335)

Also consider if all settings are still required. Maybe some can be removed?

What would also be nice - but it should/can be done in another PR/issue:

• A kind of registry like about:config in FF would be great to enable/disable experimental things
  
• Make it possible to search through the settings. So that users find them faster.

Why do you want this feature?

A settings rework is long overdue.
Many settings get added but no one ever thinks about reorganizing them.

See also #2335 (comment)

[litetex]

Duplicate of #3192