XML for GJS

[Nikita Churaev <lamefun x0r gmail com>]

Without proper XML support, a programming platform becomes outright
useless for PEOPLE, since XML is now the integral part of Web 3.0 and
everything else. It's a grave problem for GJS, since now it has no XML
support whatsoever. I want to try to do something about this.

* Make a manual binding, like we do for cairo.
* Make a GObject wrapper over libxml2 (there's already GXml, but it
requires outdated Vala version, maybe port to C not to chase Vala?).
* Make a new XML parser that is based entirely on GLib and GObject.

The latter two have a bonus that if new features are added, they'll
become immediately available for all languages that GNOME supports. What
is the best option?