Release Newsboat 2.25

Lists below only mention user-visible changes, but the full list of contributors
for this release also includes: Amrit Brar, noctux, and shenlebantongying.

Added
=====

- New elements to style with `color` command: `title`, `hint-key`,
    `hint-keys-delimiter`, `hint-separator`, and `hint-description`. If there is
    no style for one of those elements, the style of `info` is used instead. See
    "Configuring Colors" section in the docs (Alexander Batischev)
- Podboat: show an error when a podcast can't be renamed (#545) (Kartikeya
    Gupta)
- A note that the urls file can contain comments (Lysander Trischler)

Changed
=======

- Bumped minimum supported Rust version to 1.51.0
- Key hints (at the bottom of the screen) are now styled to make them easier to
    read. If you're using a custom colorscheme and want to use these new
    elements, you need to update it; see the "Configuring Colors" section in the
    docs (#1016) (Alexander Batischev)
- Podboat: move to the next item after marking a podcast finished or deleted
    (Dennis van der Schagt)
- `purge-deleted` now keeps the cursor near where it was in the list, rather
    than the *line* it was on (#1728) (Allan Wind)
- Updated translations: Dutch (Dennis van der Schagt), German (Lysander
    Trischler), Italian (Mauro Scomparin), Polish (Michał Siemek), Russian,
    Ukrainian (Alexander Batischev), and Turkish (Emir Sari)
- Updated vendored library Catch2 to 2.13.7, and json.hpp to 3.10.2

Fixed
=====

- A crash when entering a feed with an invalid filter expression (#1665)
    (Alexander Batischev)
- Slow scrolling in Podboat (#1375) (Dennis van der Schagt)
- Slow `mark-all-read` with remote APIs. It's still slow when a filter is
    applied, but without a filter it's as fast as possible (Alexander Batischev)
- A crash when `next-unread` is invoked while viewing a tag with no unread feeds
    (#1734) (Alexander Batischev)
- A crash on feeds that contain wide characters (e.g. emojis) (mcz)
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