Log Message:
xfce4-session: update to 4.16.0

Change log:

4.16.0
======
- settings: Accept all types of GIcon
- settings: Adjust inline toolbar
- Fix compilation with -Wmissing-prototypes
- Don't warn when there are no saved sessions
- bump glib (and gio, gthread, etc) minimum to 2.50.0
- Remove GSourceFunc casts
- Update .gitignore
- Add README.md to EXTRA_DIST
- Translation Updates:
  Basque, Chinese (China), Czech, Danish, Estonian, French, Galician,
  Hebrew, Hindi, Indonesian, Italian, Lithuanian, Norwegian Bokmål,
  Portuguese, Portuguese (Brazil), Russian, Serbian, Slovenian,
  Turkish, Vietnamese

4.15.1
======
- Fix potential crash in suspend and shutdown (Fixes #65)
- Avoid potential format-string vulns (Issue #65)
- settings: Tweak 'Current Session' tab
- settings: Make 'App Autostart' columns sortable
- settings: Fix 'Current session' column width (!10)
- Add lock icon, 24px and 32px icons
- Add more guards around GErrors
- Update copyright year
- Fix ifdef
- Add README.md
- Translation Updates:
  Armenian (Armenia), Basque, Belarusian (Tarask), Chinese (China),
  Czech, Danish, Eastern Armenian, Estonian, French, Hebrew, Hungarian,
  Indonesian, Norwegian Bokmål, Portuguese (Brazil), Russian, Slovak,
  Slovenian, Swedish, Turkish, Uyghur

4.15.0
======
- Use new icon in settings dialog (Bug #16885)
- Add new application icon and rDNS icon name
- logout-dialog: Add new icons
- logout-dialog: Bump icon size to 48px
- Switch to symbolic window-close icons
- Drop GDM compatibility code to avoid invalid session locale
- Segfault when suspending without pm-suspend installed (Bug #16632)
- Expand field codes
- Add a GnuPG 2.1+ mode
- Fix session crash at logout (Bug #16105)
- Free the intermediate "cmd" variable in xfsm_startup_init()
- Re-add xfsm_startup_shutdown() call to xfce4-session main()
- Remove sys/sysctl.h on linux platform
- Move from exo-csource to xdt-csource (Bug #16717)
- Try xfce screensaver before cinnamon (Bug #16223)
- Add support for xfce4-screensaver (Bug #16522)
- Silence runtime warning (Bug #15731)
- settings: Don't warn when there are no saved sessions (Fixes #62)
- settings: Add sort-on-click to columns in "Current Session" tab (!3)
- settings: Add keywords for discoverability (Bug #10694)
- settings: Add tooltips to image-buttons
- settings: Better app icon lookup
- settings: Be more precise in infobar wording
- settings: Drop inline-toolbar button labels
- settings: Move autostart info to docs.xfce
- settings: Don't make 'saved sessions' tab reorderable
- settings: Sort saved sessions by most recently used (Bug #15338)
- Add basic GitLab pipeline
- Drop unused var
- Bump copyright years
- Only clean generated sources when in maintainer mode
- Do not show translation info on --help output
- Translation Updates:
  Albanian, Arabic, Armenian (Armenia), Basque, Belarusian, Belarusian
  (Tarask), Bengali, Bulgarian, Catalan, Chinese (China), Chinese (Hong
  Kong), Chinese (Taiwan), Croatian, Czech, Danish, Dutch, Eastern
  Armenian, English (Australia), English (Canada), English (United
  Kingdom), Estonian, Finnish, French, Galician, German, Greek, Hebrew,
  Hungarian, Icelandic, Indonesian, Interlingue, Italian, Japanese,
  Kazakh, Korean, Lithuanian, Malay, Norwegian Bokmål, Norwegian
  Nynorsk, Occitan (post 1500), Polish, Portuguese, Portuguese (Brazil),
  Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swedish, Thai,
  Turkish, Uighur, Ukrainian, Vietnamese