Finalize changelog 0.8.15

Update release script

Update macOS build-stacks

Update build-scripts to use ffmpeg 7.1.2 (linux, windows)

Remove unused frame offset in bytes

Update build scripts

Remove QJadeo for good

Final nail in the ancient QT4 GUI support #59

Finalize changelog 0.8.14

Fix release script (QT UI is no more)

JACK on shutdown callback is broken on Windows

Fix jack sync w/pipewire (requires active client)

Finalize changelog 0.8.13

Xinerama support to choose startup monitor (configure: --enable-xinerama, run: -X<int>, --start-screen=<int>)

Update build-scripts