GSoC 2024: gnunet-gtk gtk4 upgrade

[Gotam Gorabh]

Hello Martin,

Note that migration from gtk3 to gtk4 especially for gnunet-gtk is not
trivial: We use libglade, which does not exist for gtk4.
We will need to decide if we want to migrate to something like
https://blogs.gnome.org/xjuan/2023/09/28/cambalache-0-16-0-released/ or
something different entirely.

Why can't we use the proper GObject concept like other gnome application does? E.g. GNOME Settings,  Nautilus, etc. which can handle the properties, and signals in a structured way.

Thanks. Regards

Gotam Gorabh