Log Message:
Update xfce4-settings to 4.13.0:

4.13.0
======
- Initial port to GTK+ 3
- Known issues:
  - The display dialog does not always build correctly. The offending
    code exists in the port to GdkSeat. When alternating between the
    old and new versions of this code, both versions do work, so there
    seems to be some strangeness at build time.
    - See dialogs/display-settings/scrollarea.c#n513
- Translation updates: Basque, Bulgarian, Chinese (China),
  Chinese (Taiwan), Croatian, English (Australia), French, German,
  Hebrew, Japanese, Korean, Lithuanian, Malay, Occitan (post 1500),
  Polish, Portuguese, Portuguese (Brazil), Romanian, Russian, Serbian,
  Slovak, Spanish, Swedish, Ukrainian

4.12.1
======
- Fix: Color scheme preview on low bit depth displays (Xfce #12223)
- Fix: Memory leak in xfce4-appearance-settings (Xfce #11746)
- Fix: /Xft/Hinting is never set (Xfce #12086)
- Fix: Segfault in convert_xfce_output_info when plugging in
  an external model, fallback on 640x480 (Xfce #12580, RH #1317382)
- Fix: xfsettingsd resets TV mode to NULL on power cycle (Xfce #11107)
- Make sure icon == NULL if no icon is found
- Make the 'Settings Editor Dialog' pluggable.
- Translation updates: Arabic, Asturian, Bulgarian, Catalan,
  Croatian, English (Australia), Galician, German, Greek,
  Hebrew, Hungarian, Icelandic, Indonesian, Lithuanian,
  Occitan (post 1500), Polish, Russian, Slovak, Swedish