v260
meson: automatically add 'extract' to 'sources'
oom: Clean up includes
oomd: implement a prekill varlink event
tree-wide: Introduce sd-forward.h and shared-forward.h headers
tree-wide: various fixlets suggested by Coccinelle
oomd: Fix Killed signal reason being lost
config files: update their header to reflect that they can be installed in /usr
Use https for freedesktop.org
license: LGPL-2.1+ -> LGPL-2.1-or-later
oomd: Add regression tests to check Killed notification gives a reason