Remove allocation flags and the "allocation-changed" signal from Clutter
This MR removes the DELEGATE_LAYOUT and the ABSOLUTE_ORIGIN_CHANGED allocation flags from Clutter, replacing the latter one with an internal boolean that's more useful and won't get in the way of optimizations and bugfixes.
Since that leaves no more allocation flags, those are removed entirely, which also leaves no reason to keep the "allocation-changed" signal, so remove that, too.
Depends on gnome-shell!1245 (merged)
Edited by Jonas Dreßler