Update the GNOME components
This updates all the elements we download from gnome.org, as GNOME recently released their latest version.
7 of these now build with Meson, which is a nice boost towards #355 (closed)!
I moved a bunch of them from tarballs to Git tags: only the ones building with Meson. The reason I did only those is that with the Autotools more deps are needed to build from Git than from a tarball, but with Meson both build identically.
And to avoid repeating gitlab.gnome.org everywhere, I added a URL alias in project.conf
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Edited by Mathieu Bridon