* Reformat GTK *.ui files
Remove useless comments since we're mostly editing those files by hand
now. Wrap multi-line text values in CDATA to avoid automated formatters
changing whitespace there in any way. Collapse empty elements.
* Switch from plain `GtkLabel`s to `GtkFrame`s for sections
Frames are reported as groupings by assistive technologies.
* Fix minor usability issues
* Make value labels labelled and selectable
* Add compat operator* for RefPtr
* Rename `*_tree_view_*` button handling helpers to `*_item_view_*`
* Move torrent item colors to CSS
* Switch to list view for torrents list (GTK 4)
* Bump Fedora image to 39 (current rawhide) for GTK 4.11
Enable deprecations as there're lots of them in 4.11 and I'm not keen on
fixing them all right now. Disable warnings as errors due to
-Warray-bounds issue somewhere in libfmt.
* Make compact mode switch work for both GTK 3 and 4
* Implement GTK 4-specific view gesture handling
* Fix torrents view context menu on GTK 4
* Explicitly show/hide menubar on startup/teardown
* Switch from `Gtk::Pixbuf` to `Gio::Icon` for views
* Support GTK 4 exceptions based on `std::exception`
* Fix options menu setup with GTK 4
* Use `delete-event` (GTK 3) and `close-request` (GTK 4) signals to handle window clousure
* Add custom file chooser button implementation
GTK 4 drops FileChooserButton widget and suggests implementing it using
Button.
* Add helpers to set X11 hints with GTK 4
* Remove `HigWorkarea` class that's no longer used
* Make main menu shortcuts work with GTK 4
* Make drops work in main window and make dialog with GTK 4
* Remove unused `gtr_action_get_widget()` helper
* Fix text direction mark setup with GTK 4 (due to switch to enum class)
* Fix file tree font size calculation with GTK 4
* Fix crash during shutdown with GTK 4
* Switch from `RadioButton` to `CheckButton` for compatibility with GTK 4
* Fix opening files with GTK 4
* Rework torrent cell renderer to support both GTK 3 and 4
* Disable system tray icon support with GTK 4
* Fix windows positioning with GTK 4
* Fix focus event handling with GTK 4
* Adapt to tree model row/iterator changes in GTK 4
* Adapt to toplevel/root window changes in GTK 4
* Adapt to clipboard changes in GTK 4
* Adapt to icon/theme changes in GTK 4
* Adapt to file/path changes in GTK 4
* Random leftover fixes for GTK 4 compatibility
* Clean up unused code
* Move GTK 3 *.ui files into a subdirectory
* Add GTK 4 *.ui files
* Search for both GTK 3 and 4 during configuration
