* Enable running of macOS packaging in GHA, most of the work done in dedbabde56
* Cleanup breakpad handling
* Have single version of main executable in folder expected by macOS and most tools instead of executable+symlink+shell script
* Handle Breakpad library lookup in more CMake way using FindBreakpad just like it's done on other platforms and packages
* Refactor error handling in some of the shell scripts to use `set -e` instead of `|| exit 1` for each command.
* Fix DMG background setup
