Release 1.15.1

!!! Last release with python 3.8 support !!!

Notable changes:
 2022-10-31 d64e3925 actionless feat(plugins: import: from image): make it work also in CLI

Submodule changes:
 2022-11-12 a78cc920 actionless chore(plugins: base16): update submodule (gtk4 and qt5/6 templates' fixes)
 2022-10-31 fff59d56 actionless chore(plugins: base16; packaging: arch): update submodule (release 1.5.1: expose CLI and sync mirror)
 2022-10-31 4fd157b7 actionless chore(plugins: base16; packaging: arch): update submodule (release 1.5: add oomox qt5/qt6 styleplugin)