New Settings categorization

Checklist

• I made sure that there are no existing issues - open or closed - which I could contribute my information to.
• I have read the FAQ and my problem isn't listed.
• I'm aware that this is a request for NewPipe itself and that requests for adding a new service need to be made at NewPipeExtractor.
• I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.

Feature description

Hey there. The team went through several rounds of discussion regarding the current Settings tree/layout, and finalised a new one that should hopefully make the menus much easier and intuitive to navigate.

Here is the current layout:

• Video and audio
• Download
• Appearance
• History and cache
• Content
• Notifications
• Updates (not on debug)
• Debug (not on release)

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Here is the new layout the team has decided on:

• Video and audio (rename to 'Player')
  • Resolution and format
    • Include seekbar thumbnail setting here
  • External player
  • Player notifications
  • Move Behaviour section into its own top level menu, because it hasn't been player-specific for ages.
• Behaviour
• Download
  • SAF and other filesystem-related settings need to be in one place. Remove from here.
• Appearance (rename to "Look and feel")
  • Move player notification menu to 'Video and audio'.
  • Move Captions to 'Video and audio'.
• History and cache
• Content (the worst offender)
  • Language section in its own top-level menu.
  • Content of main page - move to Appearance
  • PeerTube instance - move to PeerTube submenu under Services
  • Age toggles remain here (since they apply to YT and PT both).
  • YouTube-specific toggles - move to YouTube submenu under services
  • Thumbnails, comments, similar videos, description - move to Appearance
  • Database import/export - move to Backup and restore/Import and export
  • Feed section in its own top-level menu.
• Feed
  • New stream notifications
• Services (services without specific menus could have their submenus greyed out or invisible)
  • YouTube
    • Meta info and similar YT-specific stuff.
  • Soundcloud
  • media.ccc.de
  • Bandcamp
  • PeerTube
    • Instances
• Language
• Import/export or Backup/restore
  • Put SAF here, for now.
• Updates (not on debug, only on builds signed by us)
• Debug (not on release)

Why do you want this feature?

The current layout has been a struggle to fit new settings into, and has become very non-intuitive.

Additional information

No response