Update and test with some newer compilers and cmake versions
---------
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
* fix a few issues with config file output, namely an ability to print a default empty string, and to adjust the quote characters used when quoting strings or characters.
* fix formatting
* Update CMakeLists.txt
* Update README.md