News in 6.5.1, 2023-04-26
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* Tepl now depends on libgedit-gtksourceview instead of GtkSourceView:
    https://github.com/gedit-technology/libgedit-gtksourceview
    https://gedit-technology.net/
* New classes: TeplStack, TeplStackItem and TeplStackSwitcherMenu.
* Remove the attic/ (no longer necessary with the TeplStack* classes).
* Build: adapt to the latest Meson version.