We're going to remove ClutterClones, so call the parameters to
addWindow() and removeWindow() "actor" instead of "clone". Also make the
destroyIds less confusing and rename the actual actor destroy id to
"destroyId", and rename the window actors destroy id to
"windowActorDestroyId".
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1307