Release Newsboat 2.23

Lists below only mention user-visible changes, but the full list of contributors
for this release also includes: John Jarvis, Nicholas Defranco, and Raphael
Nestler.

Added
=====

- `open-in-browser-noninteractively` operation which is similar to
    `open-in-browser`, but doesn't relinquish the terminal to the browser. It
    still waits for the browser to finish executing, though (Dennis van der
    Schagt)
- Confirmation for `delete-all-articles` (#1490) (Amrit Brar)
- `%U` specifier for `feedlist-title-format` which shows the total number of
    unread articles in all feeds (#1495) (Dennis van der Schagt)
- Display images' alternate text in the article view (#1512)
    (Mark A. Matney, Jr)
- List `iframe` URLs in the article view (#1153) (Mark A. Matney, Jr)

Changed
=======

- Newsboat now refuses to enqueue a podcast if its filename is already present
    in the queue. If that happens, you'll have to adjust
    `download-filename-format` to make the filenames more distinguishable
    (#1411) (Dennis van der Schagt)
- Reduced message flickering when reloading feeds (Dennis van der Schagt)
- Updated translations: Dutch (Dennis van der Schagt), German (Lysander
    Trischler), Italian (Mauro Scomparin), Polish (Carno), Russian (Alexander
    Batischev), Turkish (Emir Sari), and Ukrainian (Alexander Batischev)
- Bumped minimum supported Rust version to 1.46.0
- Updated vendored library Catch2 to 2.13.4

Removed
=======

- `dumpform` command-line command which was only intended for debugging
    (Dennis van der Schagt)

Fixed
=====

- Missing empty lines inside `pre` tags (#1429) (Alexander Batischev)
- `open-all-unread-in-browser-and-mark-read` not synchronizing the "read" status
    to the remote API (#1449) (Dennis van der Schagt)
- Newsboat redrawing the screen once a minute even if idle (#563) (Dennis van
    der Schagt)
- `delete-all-articles` no longer deletes items that aren't visible (e.g.
    because of `ignore-mode display`) (#1360) (Alexander Batischev)
- Slashes are now replaced by underscores when generating a podcast filename
    (#836) (Dennis van der Schagt)
- File- and dirbrowsers no longer produce invalid paths when user navigates with
    arrow keys (#1418) (Dennis van der Schagt)
- Successful OPML import is no longer misreported as an error (Alexander
    Batischev)
- Descriptions in the help dialog are localized again (#1471) (Emir Sari)
- Added a newline after each `div`, since it's a block element (#1405)
    (Alexander Batischev)
- Re-introduce `set x!` (toggle) and `set x&` (reset) (#1491) (Dennis van der
    Schagt)
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