Release Newsboat 2.15

Added
=====
- `random` `article-sort-order` (Jagannathan Tiruvallur Eachambadi)
- Cursor position in article list is reset after marking the feed as read
    (Stefan Assmann)

Changed
=======
- Update vendored version of Catch2 to 2.7.0
- Give our Snap access to `xdg-open`
- Make "delete all items" work in query feeds (Alexander Batischev) (#456)

Fixed
=====
- Use a native compiler for internal tools when cross-compiling (maxice8)
- Always write to `error-log`, no matter the log level specified on the command
    line (Alexander Batischev)
- (Regression) Let users interact with programs run by "exec:", backticks in
    config, and `*-passwordeval` settings (Alexander Batischev) (#455)
- Do not add deleted items to query feeds (Alexander Batischev) (#456)
- Setup directories before importing feeds, to avoid the import silently failing
    (Neill Miller)
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