CMake

Merge pull request #90 from dlparkhurst/mix_error #378

# to view logs

Run time

Learn about OS # on GitHub Actions

Job	Run time
build (macos-latest)	2m 10s
🚧⚫ mingw32	22s
build (ubuntu-latest)	2m 26s
build (windows-latest)	3m 30s
ctest (macos-latest)	1m 32s
ctest (ubuntu-latest)	2m 16s
ctest (windows-latest)	2m 49s
	15m 5s