GtkIconTheme: Allow unthemed icons from resource paths
GtkIconTheme: Allow unthemed icons from resource paths

This makes it pretty straightforward to add individual icons
that don't need to be present in multiple sizes.

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