v83

The first release in over six years; many of these changes have already been running on my node for a long time, but I was always too lazy to tie it all up into a new release. Not anymore!

### Added

- Debug logging for unregistering USKs.
- Log decisions for loading/not loading elements.
- Also download files from archives.
- Allow not loading posts or replies that are older than _n_ days, to reduce memory usage.

### Changed

- Update to Gradle 8.14.5.
- Update Fred dependency to build 1501.
- Update dependencies to work with Java 21.
- Reduce dependency on `net.pterodactylus.utils` package.
- Convert more code to Kotlin.
- Refactoring of some tests to rely less on Mockito.
- Mention in web interface that the WebOfTrust plugin might take some time to create identities.
- Improve extraction of text from sites.
- Link parser considers colons as parts of links only if they’re not followed by whitespace.
- Slightly improve styling of page footer.
- Update README.md to reflect changed name of Hyphanet.
- Updated all translations.

### Removed

- Remove FindBugs plugin from build.
- Remove all mentions of Flattr; it’s dead. 🙁

### Fixed

- Broken USK links will no longer be parsed.
- `NullPointerException` during Sone removal.
- Make it possible again to change languages on-the-fly.
- Fix name of test that wouldn’t work on Windows.
- Fix tests failing on non-English systems.
- Fix loading elements when the URL would be too long.
- Fix logging of DefaultElementsLoader by keeping the logger instance alive.
- XML parser is no longer vulnerable to XXE vulnerability. (This is only listed in “Fixed” and not in “Security” because there was never a way to actually exploit it.)
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