[fractal] (19 commits) Non-fast-forward update to branch multi-account

[Alejandro Domínguez <aledomu src gnome org>]

The branch 'multi-account' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  2648ed5... Make gap at the start of the headerbar to add account switc
  339a830... Add account switcher
  c743649... Connect button to open login page
  68f1d3e... Replace AdwAvatar with a GtkImage in the "Add Login" row in

Commits added to the branch:

  65d2548... Add contribution guidelines (*)
  7eb6c1f... Set RUST_BACKTRACE=1 at runtime using manifest (*)
  fcf41ee... Improve doc comments (*)
  5973f3f... login: improve style for the devel warning (*)
  f5cb220... clippy: Fix warnings (*)
  44c55b7... clippy: Implement Default where possible (*)
  ab96d0c... clippy: Allow module_inception (*)
  d9ac516... sidebar: Refactor to be less noisy (*)
  c85ac6d... clippy: Stop unnecessary referencing (*)
  44053ca... user: Make User subclassable (*)
  b2ac1c6... Add Member object (*)
  e52f067... Specialize User to Member where possible (*)
  a588349... member: Refactor update from events (*)
  22f697c... member: Add power-level property (*)
  aa649a8... room: Add PowerLevels GObject (*)
  fd34f7d... Make gap at the start of the headerbar to add account switc
  5f31880... Add account switcher
  a6d040e... Connect button to open login page
  28a2e9a... Show checkmark and blue circle around account avatar for vi

(*) This commit already existed in another branch; no separate mail sent