Florian Müllner d65de0df60 st/icon-theme: Use standard GObject macros
The GTK code predates the G_DECLARE_*() macros, so it's under- standable
that it still does all the boilerplate manually. We
don't have that excuse in 2023, so move the the standard macros.

There is no reason for GtkIconTheme to be derivable, and as that
means that the instance struct itself is private, stop adding
separate private instance data.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2620>
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