pygobject 3.52 has switched [1] to using libgirepository-2.0 which
comes from glib itself now, rather than the 1.0 which came from
gobject-introspection.
This means that it fails to load the incompatible "GIRepository 2.0"
and thus must be ported to 3.0 (which is provided by
libgirepository-2.0).
This also means that we have to bump the minimum version of glib to
2.80
Migration guide is here [2]
[1]: https://gitlab.gnome.org/GNOME/pygobject/-/merge_requests/320
[2]: https://docs.gtk.org/girepository/migrating-gi.html
Install the python module to the data directory, not the python install
directory that meson gives us. Then, in the main script, try to find the
module and add it to the path by assuming the script is installed to
(prefix)/bin. Hopefully this will fix the ModuleNotFound errors.
Also:
- Install the script to <prefix>/bin
- Fix a bug in XmlReader that would cause "uninteresting" tags to not be
fully ignored
- Other minor improvements
