* a lot new contributors stepped in, see https://github.com/Psycojoker/prosopopee#authors
* possibility to specify an (optional) menu https://github.com/Psycojoker/prosopopee#menu made by beudbeud
* configure Graphics Magick options on a global or per images fashion https://github.com/Psycojoker/prosopopee#gm and https://github.com/Psycojoker/prosopopee#images-handling by capslock and jmk
* support for various themes and a new material theme in addition of the default one https://github.com/Psycojoker/prosopopee#gm by beudbeud
* tags support in gallery settings https://github.com/Psycojoker/prosopopee#gallery-settingsyaml by beudbeud
* introduce internal CACHE format version to avoid breaking build when changing it
