Improvements to macOS installer
- 
Fixes #1893 (closed)  - 
Fixes #1790 (closed)  - 
Closes #1894 (closed)  - 
Fallback to clang requires update of preprocessor  - 
Check compatibility with meson rewrite of build system  - 
M2 Mini Runner: MATLAB R2023b arm64 version needs to be installed in /Applications/MATLAB/arm64/R2023b  - 
M2 Mini Runner: MATLAB R2023b x86_64 version needs to be installed in /Applications/MATLAB/x86_64/R2023b  - 
M2 Mini Runner: MATLAB R2016b x86_64 version needs to be installed in /Applications/MATLAB/x86_64/R2016b  - 
Testing on clean installs  - 
Decide whether to also distribute the package additionally as a zip file  - 
Fixing the gitlab-ci.yml  
Edited  by Willi Mutschler