CMake

Merge pull request #82 from dlparkhurst/mix_error #337

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Job	Run time
🚧⚫ mingw32	13s
build (macos-latest)	1m 35s
build (ubuntu-latest)	2m 36s
build (windows-latest)	3m 13s
ctest (macos-latest)	1m 28s
ctest (ubuntu-latest)	2m 8s
ctest (windows-latest)	3m 11s
	14m 24s