[gnome-games] (10 commits) Non-fast-forward update to branch wip/exalm/performance

[Alexander Mikhaylenko <alexm src gnome org>]

The branch 'wip/exalm/performance' 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:

  976a1b6... mame: Use an intermediate variable in get_supported_games()

Commits added to the branch:

  23be2b7... flatpak: Fix tracker 'systemd_user_services' value (*)
  d8c2bf0... ui: Remove 'builder' icon from PreferencesWindow (*)
  100ba13... Place property getters before setters (*)
  3d5473a... Prefer properties over methods (*)
  9a2a56b... Use 'as' to cast wherever possible (*)
  913108c... Add missing spaces before opening braces (*)
  37d3415... Remove spaces before semicolons in 'for' statements (*)
  81adb7a... Remove unnecessary semicolons after 'while(){}' (*)
  a871c2c... playstation: Fix get_playstation_info() signature (*)
  961af07... mame: Use an intermediate variable in get_supported_games()

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