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And make it desktop only for now.

This code will be shared when the big split between window
and desktop capture happens.

Instead of using GStreamer, use PipeWire directly.

Fix typo in meson.build

See merge request !6

Use pkgconfig to look up libobs.pc

See merge request !3

Add xdg-desktop-portal to dependencies

See merge request !2

Instead of using find_library which would only look on /usr in my case
(which is not where obs is because it's a development branch).

Not everyone has an updated GLib for that.

This is a bit broken right now on GNOME Shell / Mutter side,
but it should still be okay since window instrospection is
hidden behind a GSetting anyway.

Add the same prefix everywhere, remove useless ones.

Introduces the plugin, which itself depends on GStreamer,
GDBus, and GLib in general.