Test with a web, desktop and mobile client and finish relevant calls

Let's make sure we can at least connect with one. Let's create some videos and screenshots, maybe also to the configuration screen too with instructions how to connect.

Tested clients:

• Mastodon Android - cf https://realize.be/notes/2335
• Fread
• Fedilab - crashes after first connection, is fine when reopening
• Sengi - both web and desktop work fine
• Phanpy (web) - works very nicely!
• Tusky (android) - seems to be calling endpoints all the time
• Tooty (web): works ok (but does not follow the api completely, but easy to setup local)

  Most (linux) desktop clients are having troubles, but should focus less on that.

  Finish any (missing) api endpoints to the point where clients can work and don't crash at least:

  • paging min_id, max_id
  • 'right' content (likes, notifications, replies, context)
  • Direct messages
  • markers/mark read - (we set read status in the calls for now)
  • status delete
  • Search
  • pinned filtering (return empty for now)
  • Timelines (home / timeline / public / local)
  • Check handleUserUpdate (seriously!)
  • Manage connections (delete tokens and such on api page per user)
  • Apps creation: support for multipart
  • Preferences endpoint
  • permissions (already ok!)