[libadwaita] (8 commits) Non-fast-forward update to branch wip/exalm/dark

[Alexander Mikhaylenko <alexm src gnome org>]

The branch 'wip/exalm/dark' 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:

  e289430... Add AdwSettings
  a298334... Add AdwStyleManager
  756efe9... application: Add style-manager property
  7f86d8c... application: Remove gtk-application-prefer-dark-theme menti
  df1a8e6... application: Use AdwStyleManager properties to control styl
  8419c7e... demo: Rework the dark mode button
  4e55fe6... doc: Mention HdyStyleManager in migration guide
  7589fa3... doc: Mention default color scheme change in migration guide

Commits added to the branch:

  68c652f... Add AdwSettings
  67d1974... Add AdwStyleManager
  1398b64... application: Add style-manager property
  da1531f... application: Remove gtk-application-prefer-dark-theme menti
  9f7c5f4... application: Use AdwStyleManager properties to control styl
  0c893ac... demo: Rework the dark mode button
  6c46d81... doc: Mention HdyStyleManager in migration guide
  9c9b93d... doc: Mention default color scheme change in migration guide