Use ExternalProject instead of FetchContent for project scope separation and flexibility. This has recently become performant via enhancements to CMake ExternalProject.

Turn TLS verification for all Git and Download operations

Find MPIexec more robustly

write more metadata for easier simulation reading

Full Gemini3D functionality continues to require CMake >= 3.19. Intel Fortran requires Cmake >= 3.20. Please run

cmake -P scripts/install_cmake.cmake

if you have old CMake