Add some quotes to paths passed as compiler flag arguments in CMake

This fixes a broken build on windows, and seems like it should not
have been working when using Makefile generators on any platform,
i.e., macOS & other *nix

The library now builds with Intel MPI (from Intel OneAPI) and GCC +
GFortran. There are still some path handling quirks and string quoting
things that need to be resolved to get the caf and cafrun wrapper
scripts working reliably. A test program can be built and run by
tweaking/fixing the commands attempted by the caf script. The program
executes correctly and then encounters an error during MPI
finalize/when shutting down.

No special changes needed beyond robustness improvements

Use CMakes FindThreads feature/module to find pthreads since
they are used in the mpi opencoarrays library. As a result
the caf wrapper script should also link in/build with pthreads

… windows-support

The intrinsic FindMPI module seems like it has some bugs or
documentation bugs. I got this working, but it is a bit of black magic
as to how/why it works. It simplifies the code, however, and should
offload some maintanence upstream, so it's worth doing.

Some usage of deprecated variables provided in older version of
FindMPI were removed, updating them to the new, correct variables.

The cmake_minimum_required_version was also bumped along with CMake
policies.

These scripts get configured to call the bash version found during
CMake configuration time. Using this version/installation of bash, the
batch files call the corresponding bash caf & cafrun scripts and pass
all arguments through. This *should* allow things like fpm to work
with the caf wrapper scripts, *I beleive* (untested)

CAVEAT: WSL's bash will dump you into your WSL home directory and
there's no obvious work around. If you put Git-Bash's bash.exe (in the
bin subdirectory) first on your path you *should* be in business (I
think). There may be weird edge cases.

If you have Git-Bash's bash.exe in the front of your path,
you can now do everything from within the Intel OneAPI CMD.exe shell.
If you experience issues you should launch git-bash from the OneAPI
CMD.exe shell and it will inherit your environment variables and be
more robust. If CMake finds WSL, you're probably hosed.

A bunch of the variable manipulation should be abstracted as a
function.

windows. Also invoke perl directly so style/linting on windows works.

Thanks to @rouson and @everythingfunctional for the review and great suggestions!

Co-authored-by: Damian Rouson <rouson@lbl.gov>
Co-authored-by: Brad Richardson <everythingfunctional@protonmail.com>