Fix fullscreen mode not working correctly for QT apps (bug #8563)

Signed-off-by: Simon Steinbeiss <simon.steinbeiss@elfenbeinturm.at>
Use correct type on platforms where time_t is 64bits like OpenBSD

Signed-off-by: Simon Steinbeiss <simon.steinbeiss@elfenbeinturm.at>
I18n: Update translation he (98%).

170 translated messages, 2 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
Add support for GTK frame extents

This is required for proper positionning and
resizing of CSD windows from GTK3/GNOME.

Signed-off-by: Olivier Fourdan <fourdan@xfce.org>
Add new default themes

To better integrate with GTK3/GNOME apps.
Also include hdpi and xhdpi variants.

Signed-off-by: Olivier Fourdan <fourdan@xfce.org>