CMake

Merge pull request #87 from dlparkhurst/mix_error #370

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Job	Run time
build (macos-latest)	1m 54s
build (ubuntu-latest)	2m 24s
🚧⚫ mingw32	14s
build (windows-latest)	3m 24s
ctest (macos-latest)	1m 28s
ctest (ubuntu-latest)	2m 0s
ctest (windows-latest)	3m 30s
	14m 54s