GtkAppliation: setup icon theme resource path
GtkAppliation: setup icon theme resource path

If we have a resource base path for the application, set up an icon
theme search path based on it (within the default icon theme).

https://bugzilla.gnome.org/show_bug.cgi?id=722092

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