Release 3.9.0nightly3 (r3_9_0nightly3)

• Bugfix: Correct new channel not being shown to others if it connects with null channel info (#2754, #2774).
  (contributed by @softins)

• Client: Improved performance of GUI when someone joins or leaves a server (#2738).
  (contributed by @ann0see)

• Client: Bugfix: Removed channel number from saved fader tag when --ctrlmidich is in use. In this release --cleanuplegacyfadersettings can be used on any saved fader settings that have been corrupted to attempt recovery (#2839).
  (contributed by @pljones)

• Server: Fixed --serverinfo country code misinterpretation introduced in Jamulus 3.9.0 on Qt6-based builds such as Mac (#2829).
  (contributed by @hoffie)

• Server: Added support for ISO country codes (de, gb, nl, ...) in --serverinfo (#2841).
  (contributed by @hoffie)

• Directory: Bug: Correct default "self" address for directory, enabling use as a server (#2812).
  (contributed by @pljones)

• Directory: Bug: Use configured Directory Public IP for Client when hole-punching (#2819).
  (contributed by @pljones)

• CLI: Rephrased recording options help text on the --help output for clearer description of their functionality (#2832).
  (contributed by @ann0see)

• Windows: Upgraded JACK build to use JACK 1.9.21 (#2665).
  (contributed by @ann0see)

• Translation: Added nb_NO App translation (#2849).
  (contributed by @ann0see)

• Translations updated from Hosted Weblate (#2835, #2852).
  (contributed by @weblate)

• Refactoring: Moved around files to clean up the repository (#2822, #2824, #2834, #2838).
  (contributed by @ann0see)

• Build: Android: Export NDK root (#2764).
  (contributed by @pljones)

• Build: Debian/Ubuntu: Fixed .deb Changelog generation (#2793).
  (contributed by @hoffie)

• Build: Debian/Ubuntu: Fixed displayed version for non-release builds to removed incorrect -dirty suffixes (#2802).
  (contributed by @hoffie)

• Build: Debian/Ubuntu: Renamed headless .deb file to jamulus-headless_[version]_ubuntu_[arch].deb for consistency with binary. This might need changes to scripts downloading this .deb file (#2821).
  (contributed by @ann0see)

• Build: Mac: Combined Intel & M1 builds into a single Universal binary and improved M1 -dev build user-friendliness by introducing ad-hoc signing support (#2808, #2825).
  (contributed by @hoffie)

• Build: Bump versions: actions/upload-artifact from 2 to 3 (#2796), actions/cache from 2 to 3 (#2798), DoozyX/clang-format-lint-action from 0.12 to 0.14 (#2797), actions/checkout from 2 to 3 (#2799).
  (contributed by @dependabot)

• Build: Updated bundled Qt6 to version 6.3.2 (#2846).
  (contributed by @github-actions)

• Internal: Enabled automated dependency updates via dependabot and custom automation (#2777, #2778, #2801, #2803).
  (contributed by @hoffie)

• Internal: Hardened build scripts and tooling against silent failures (#2794).
  (contributed by @hoffie)