[libadwaita] (12 commits) Non-fast-forward update to branch wip/exalm/avatar-paintable

[Alexander Mikhaylenko <alexm src gnome org>]

The branch 'wip/exalm/avatar-paintable' 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:

  fdcbc8a... avatar: Reindent the header
  f4ef16b... avatar: Move the size property to the bottom
  fc89613... avatar: Replace image load func with paintables
  4015b3b... doc: Mention avatar changes in the migration guide
  336519d... ci: Update ABI break commit

Commits added to the branch:

  54cb1d5... stylesheet: Make the README Markdown (*)
  11f49c6... Use title case for titles in Markdown files (*)
  e3e7bd8... Use # for titles (*)
  2baf0f3... hacking: Drop redundant empty lines (*)
  ceb2c87... hacking: Describe how to style function prototypes (*)
  7f61711... Standardize function prototypes (*)
  83a4b5a... leaflet: Fix an indentation issue (*)
  85e1114... avatar: Reindent the header
  74eadcd... avatar: Move the size property to the bottom
  ce84ea1... avatar: Replace image load func with paintables
  a133c1d... doc: Mention avatar changes in the migration guide
  2e9cb76... ci: Update ABI break commit

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