cssselector: Add initial support for :not()
cssselector: Add initial support for :not()

:not() works for names, ids, classes and pseudoclasses based on states.

It does not yet work for positional pseudoclasses (like :last-child or
:even) as there is region madness going on with those.

ahodesuka/gtk,alexlarsson/gtk,grubersjoe/adwaita,jigpu/gtk,alexlarsson/gtk,ahodesuka/gtk,jadahl/gtk,jigpu/gtk,ahodesuka/gtk,jigpu/gtk,grubersjoe/adwaita,ahodesuka/gtk,Adamovskiy/gtk,chergert/gtk,ahodesuka/gtk,davidgumberg/gtk,davidgumberg/gtk,chergert/gtk,Adamovskiy/gtk,grubersjoe/adwaita,ahodesuka/gtk,jadahl/gtk,Adamovskiy/gtk,alexlarsson/gtk,ahodesuka/gtk,jigpu/gtk,Lyude/gtk-,chergert/gtk,chergert/gtk,jigpu/gtk,davidgumberg/gtk,Lyude/gtk-,Adamovskiy/gtk,davidgumberg/gtk,Lyude/gtk-,jadahl/gtk,jigpu/gtk,Lyude/gtk-,grubersjoe/adwaita,davidgumberg/gtk,grubersjoe/adwaita,jadahl/gtk,chergert/gtk,alexlarsson/gtk,jadahl/gtk,jigpu/gtk,jadahl/gtk,Adamovskiy/gtk,davidgumberg/gtk,alexlarsson/gtk,chergert/gtk,grubersjoe/adwaita,grubersjoe/adwaita,ahodesuka/gtk,Adamovskiy/gtk,grubersjoe/adwaita,Adamovskiy/gtk,Adamovskiy/gtk,jadahl/gtk,Lyude/gtk-,alexlarsson/gtk,chergert/gtk,jigpu/gtk,chergert/gtk,davidgumberg/gtk,Lyude/gtk-,davidgumberg/gtk,jadahl/gtk,alexlarsson/gtk,Lyude/gtk-,Lyude/gtk-,alexlarsson/gtk