2.21.13
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Thanks to Michael Meeks and Thomas Thurman for improvements in this version.

 - Only use compositor version if we have a compositor (Thomas) (#514453)
 - Remove workaround for a problem in an ancient GTK version (Thomas) (#513737)
 - Compositor efficiency fixes (Michael)
 - Various tools added (Thomas)

Translations
 Amitakhya Phukan (as), Rhys Jones (cy), Andre Klapper (de), Takeshi AIHANA (ja),
 Arangel Angov (mk), Tomasz Dominikowski (pl), Duarte Loreto (pt)