[gnome-games] (21 commits) Non-fast-forward update to branch wip/exalm/libhandy2

[Alexander Mikhaylenko <alexm src gnome org>]

The branch 'wip/exalm/libhandy2' 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:

  be88b4e... ui: Rename hbox1 to content_box in PreferencesWindow
  133bec9... ui: Add PreferencesSubpage
  6e05eab... ui: Add 'subpage' property to PreferencesPage
  95430c6... ui: Add subpage support to PreferencesWindow
  6dc187f... ui: Convert GamepadConfigurer into PreferencesSubpageGamepa
  ec825cc... ui: Convert KeyboardConfigurer to PreferencesSubpageKeyboar
  8ace677... ui: Remove immersive mode from preferences
  bf13b46... ui: Remove visible_page_changed() from PreferencesPage
  e9b670d... ui: Drop custom headerbars from preferences pages
  ff82e0a... flatpak: Build libhandy
  f913219... build: Add libhandy dependency
  a09f220... ui: Add subpage transition for PreferencesWindow
  810a1af... ui: Wrap plugin descriptions
  1d7b40e... ui: Use HdyColumn for preferences pages
  c1ebdd6... ui: Use HdyLeaflet in preferences window
  b5fd763... fixme: Add css from libhandy example
  29e74c7... ui: Use HdyTitleBar in preferences window
  b5b0d7f... ui: Add PreferencesSidebar
  6766af7... ui: Use PreferencesSidebar in preferences window
  5ee1363... ui: Remove unnecessary box from preferences winow

Commits added to the branch:

  d652ba7... ui: Rename hbox1 to content_box in PreferencesWindow
  ae0e297... ui: Wrap plugin descriptions
  653feaf... ui: Add PreferencesSubpage
  23e8d43... ui: Add 'subpage' property to PreferencesPage
  2fd9286... ui: Add subpage support to PreferencesWindow
  d2aad98... ui: Convert GamepadConfigurer a subpage
  bc4bfd6... ui: Convert KeyboardConfigurer into a subpage
  dc4c0de... ui: Clean up PreferencesPageControllers
  a658688... ui: Remove immersive mode from preferences
  774226a... ui: Remove visible_page_changed() from PreferencesPage
  ef8e569... ui: Drop custom headerbars from preferences pages
  98a08b2... flatpak: Build libhandy
  0ae190b... ci: Build libhandy for cross_distro targets
  b9761f7... build: Add libhandy dependency
  6803313... fixme: Add css from libhandy example
  f26f739... ui: Use HdyColumn for preferences pages
  8466211... ui: Use HdyLeaflet in preferences window
  4cdb3e2... ui: Use HdyTitleBar in preferences window
  0828db6... ui: Add PreferencesSidebar
  45ad34a... ui: Use PreferencesSidebar in preferences window
  41629d8... ui: Remove unnecessary box from preferences winow