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Add gtk4 list models

From upstream commit 0ef0edfa9a9bb6c1bb25cf5742f3d61afed8e001.

Newer commits were more difficult to incorporate because the sources included in gtk/roaring were spewing tons of warnings/errors.

We will get rid of this folder once we switch to Gtk4 down the line so it shouldn't be a problem.

Split out from !466 (closed) because that allows to use the list models outside of the history as well (manager could f.e. use GtkFlattenListModel for the origins).

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