Log Message:
libxfce4util: update to 4.16.0

Change log:

4.16.0
======
- Prepare for 4.16 final release
- Properly handle URI schemes other than "file"

4.15.6
======
- Update configure.ac.in syntax
- Namespace of the gir needs capital first letter
- Bump GLib (and gio, gthread, etc) minimum to 2.50.0
- Remove typedef already defined by G_DECLARE_FINAL_TYPE macro
  (Fixes #4)

4.15.5
======
- Bump Xfce version to 4.16pre2
- Add README.md to EXTRA_DIST

4.15.4
======
- Create README.md
- Translation Updates:
  Albanian, Armenian, Hebrew, Slovak, Uyghur

4.15.3
======
- Version bump in preparation of 4.16pre1

4.15.2
======
- Complete the field codes expansion

4.15.1
======
- Add field codes expansion and related utilities (code moved from garcon)
- docs: Show the "Miscellaneous Utilities" section
- Add basic GitLab pipeline
- Translation Updates:
  Albanian, Armenian (Armenia), Asturian, Belarusian, Hindi, Italian,
  Spanish, Uzbek

4.15.0
======
- Bump the Xfce version to 4.15
- Translation Updates:
  Albanian, Galician, Spanish