4.20.1 - clipboard-manager: Fix memory leak - I18n: Update po/LINGUAS list - build: Automate copyright year management - build: Remove libxfce4ui-config.h from GI - clipboard-manager: Preserve all image formats when taking ownership - Delete obsolete file libxfce4ui-1.pc.in - build: Include local header libxfce4ui/libxfce4ui.h - build: Fix include guard position - Add variadic functions to Vala - Fix namespace for GObject introspection - Translation Updates: Albanian, Amharic, Arabic, Armenian, Armenian (Armenia), Asturian, Azerbaijani, Basque, Belarusian, Bulgarian, Catalan, Chinese (China), Chinese (Hong Kong), Chinese (Taiwan), Croatian, Czech, Danish, Dutch, Eastern Armenian, English (Australia), English (United Kingdom), Estonian, Finnish, French, Galician, Georgian, German, Greek, Hebrew, Hungarian, Icelandic, Indonesian, Interlingue, Italian, Japanese, Kazakh, Korean, Lithuanian, Malay, Norwegian Bokmål, Norwegian Nynorsk, Occitan (post 1500), Persian (Iran), Polish, Portuguese, Portuguese (Brazil), Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swedish, Telugu, Thai, Turkish, Ukrainian, Uyghur, Venetian, Welsh