inspector: be careful about gsize vs guint64
inspector: be careful about gsize vs guint64

Since gsize doesn't work as a typename in a ui file,
we have to be careful not to pass pointers to wrongly
sized variables when getting the guint64 values out
of the model.

https://bugzilla.gnome.org/show_bug.cgi?id=742664

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