Merge branch 'macos-installer-5.x' into '5.x'

.gitignore

.gitlab-ci.yml

README.md

doc/manual/source/installation-and-configuration.rst

m4/ax_matlab_arch.m4

m4/ax_mexopts.m4

macOS/Makefile

macOS/brewfiles/gcc.rb

macOS/brewfiles/gmp.rb

macOS/brewfiles/isl.rb

macOS/brewfiles/libmpc.rb

macOS/brewfiles/mpfr.rb

macOS/brewfiles/zstd.rb

macOS/build.sh

macOS/conclusion_template.html

macOS/deps/Makefile

macOS/distribution_template.xml

macOS/scripts/postinstall

macOS/welcome_template.html

matlab/add_path_to_mex_files.m