GtkWidget: Mark deprecated properties as such
GtkWidget: Mark deprecated properties as such

The ::style, ::margin-left and ::margin-right properties are all
deprecated.

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