remove build number from version string

Added automatic release creation to github action

Version 1.4.2

Static ffmpeg build for Linux

Previously the system version of ffmpeg was linked dynamically by accident

Cleaned up CMake and added (untested) MacOS options

Version 1.4.1.1810

Bumped to version 1.4.0.1790

Version 1.3.5.1733

Version 1.3.4.1678