Added GtkCellArea & GtkCellAreaContext to GtkIconView
Added GtkCellArea & GtkCellAreaContext to GtkIconView

First commit to icon-view-refactor, essentially only adds the
construct-only "cell-area" property and the context but doesnt
use it.

grubersjoe/adwaita,Lyude/gtk-,ahodesuka/gtk,chergert/gtk,jigpu/gtk,Sidnioulz/SandboxGtk,davidgumberg/gtk,simokivimaki/gtk,Sidnioulz/SandboxGtk,Adamovskiy/gtk,jadahl/gtk,chergert/gtk,bratsche/gtk-,Sidnioulz/SandboxGtk,jadahl/gtk,ahodesuka/gtk,Distrotech/gtk2,jigpu/gtk,Sidnioulz/SandboxGtk,davidgumberg/gtk,simokivimaki/gtk,jessevdk/gtk,grubersjoe/adwaita,ebassi/gtk,ahodesuka/gtk,jessevdk/gtk,Lyude/gtk-,davidt/gtk,alexlarsson/gtk,Adamovskiy/gtk,Adamovskiy/gtk,simokivimaki/gtk,chergert/gtk,Lyude/gtk-,bratsche/gtk-,jigpu/gtk,chergert/gtk,jessevdk/gtk,grubersjoe/adwaita,Distrotech/gtk2,ahodesuka/gtk,grubersjoe/adwaita,davidt/gtk,ahodesuka/gtk,Lyude/gtk-,ebassi/gtk,Adamovskiy/gtk,ebassi/gtk,davidgumberg/gtk,simokivimaki/gtk,msteinert/gtk,alexlarsson/gtk,jadahl/gtk,jessevdk/gtk,Adamovskiy/gtk,grubersjoe/adwaita,bratsche/gtk-,ahodesuka/gtk,Lyude/gtk-,Adamovskiy/gtk,davidgumberg/gtk,Lyude/gtk-,ebassi/gtk,davidt/gtk,alexlarsson/gtk,simokivimaki/gtk,chergert/gtk,grubersjoe/adwaita,msteinert/gtk,msteinert/gtk,davidgumberg/gtk,jadahl/gtk,ahodesuka/gtk,simokivimaki/gtk,jadahl/gtk,Lyude/gtk-,jigpu/gtk,jadahl/gtk,msteinert/gtk,jessevdk/gtk,msteinert/gtk,jessevdk/gtk,bratsche/gtk-,jadahl/gtk,ebassi/gtk,bratsche/gtk-,jessevdk/gtk,Sidnioulz/SandboxGtk,ebassi/gtk,Distrotech/gtk2,chergert/gtk,alexlarsson/gtk,Lyude/gtk-,davidt/gtk,jadahl/gtk,grubersjoe/adwaita,ahodesuka/gtk,davidt/gtk,jigpu/gtk,Distrotech/gtk2,davidgumberg/gtk,Adamovskiy/gtk,Distrotech/gtk2,jigpu/gtk,davidgumberg/gtk,davidt/gtk,chergert/gtk,Adamovskiy/gtk,alexlarsson/gtk,Distrotech/gtk2,Sidnioulz/SandboxGtk,msteinert/gtk,bratsche/gtk-,alexlarsson/gtk,jigpu/gtk,alexlarsson/gtk,jigpu/gtk,grubersjoe/adwaita,davidgumberg/gtk,chergert/gtk,alexlarsson/gtk