Release 3.9.0nightly2 (r3_9_0nightly2)

Nightly release 2. Includes all changes since release 3.9.0 to date:

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

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

• 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)

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

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

• Build: 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)

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