Release Newsboat 2.20

Lists below only mention user-visible changes, but the full list of contributors
for this release also includes: Björn Esser, Jan Staněk, Mario Rugiero, Rui
Chen, and Tobias Kortkamp.

Added
=====

- An FAQ item on why TT-RSS authentication might fail (#44) (Alexander
    Batischev)
- An FAQ item on browser failures in Newsboat 2.18 (Alexander Batischev)
- Ability to bind multiple keys to the same operation (#110) (Dennis van der
    Schagt)
- Ability to bind operations to Tab key (Dennis van der Schagt)
- New format specifiers for `articlelist-format`: `%n` (article unread), `%d`
    (article deleted), `%F` (article's flags) (Dennis van der Schagt)
- New format specifier for `feedlist-title-format`,
    `articlelist-title-format`, and `searchresult-title-format`: `%F`, which
    contains current filter expression. That specifier is now included into
    those settings by default (#946) (Dennis van der Schagt)
- New setting, `switch-focus`, which specifies a key that moves the cursor
    between widgets in File- and DirBrowser (Dennis van der Schagt)
- New setting, `wrap-scroll`, which makes the cursor jump to the last item when
    scrolling up on the top one, and vice versa (David Pedersen)
- `exec` command-line command, which allows to run an arbitrary operation (#892)
    (Marco Sirabella)
- Dependency on martinmoene/optional-lite and martinmoene/expected-lite
    libraries, both of which we vendor
- Include enclosure URL in the article's urlview (#809) (Spacewalker2, Alexander
    Batischev)
- Allow `open-in-browser` and `open-in-browser-and-mark-read` operations in the
    URL view, where they open the selected URL (David Pedersen)
- Open command line when a number key is pressed in a tag-list (#939) (Dennis
    van der Schagt)
- Install Newsboat's SVG icon as part of `install` target (Nikos Tsipinakis)

Changed
=======

- Merged es and es_ES translations into one (Marcos Cruz)
- Updated translations: Dutch (Dennis van der Schagt), German (Lysander
    Trischler), Russian (Alexander Batischev), Spanish (Marcos Cruz), Turkish
    (Emir Sari), Ukrainian (Alexander Batischev)
- It's now an error to have `always-download` or `reset-unread-on-update`
    without parameters (Alexander Batischev)
- It's now an error to have `macro` without at least two arguments (Alexander
    Batischev)
- The conditional format sequence (`%?[char]?[format]&[format]?`) now treats
    whitespace-only value as empty. This allows changing the formatting of, for
    example, "unread" and "deleted" fields in articlelist-format (Dennis van der
    Schagt)
- `open-in-browser-and-mark-read` in feedlist no longer marks articles read if
  the browser fails (Nikos Tsipinakis)
- Macro execution halts if one of the operations fails (Nikos Tsipinakis)
- Inoreader now marks articles read on a thread, to hide latency (#710)
    (pi.scateu.me)
- Bumped minimum supported Rust version to 1.40.0
- Updated vendored libraries: Catch2 to 2.12.2, json.hpp to 3.8.0

Removed
=======

- Newsboat's Inoreader API keys. Users need to register their own Inoreader
    application now, and set them via `inoreader-app-id` and `inoreader-app-key`
    settings. Please see "Inoreader" section in the HTML documentation for
    details. (Alexander Batischev)

Fixed
=====

- Help dialog showing operations as unbound even though they *are* bound to some
    keys (#843) (Dennis van der Schagt)
- `feedlink` attribute containing feed title instead of feed URL (Alexander
    Batischev)
- `feeddate` attribute containing fixed string instead of item's publication
    date and time (Alexander Batischev)
- `browser` setting not working if it contains `<` (#917) (Dennis van der
    Schagt)
- `up`, `down`, `pageup`, `pagedown`, `home`, and `end` now working in macros
    (#890) (Dennis van der Schagt)
- Backslash inside double quotes requiring three escapes instead of one, every
    other time (#536, #642, #926) (Alexander Batischev)
- Users can bind operations to `UP`, `DOWN`, `HOME`, `END`, `NPAGE`, and `PPAGE`
    keys (#903) (Dennis van der Schagt)
- Generate example config as part of `doc` target, so `install-examples` can
    simply copy it instead of generating (Alexander Batischev)
- Install manpages via `install-docs` target, not `install-newsboat` and
    `install-podboat` (#829) (Alexander Batischev)
- The wrong feed being opened (#72) turned out to be caused by a bug in libstfl.
    A patch for that library is available at
    https://github.com/dennisschagt/stfl/pull/4#issuecomment-613640246 (Dennis
    van der Schagt)
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