CMake

Merge pull request #83 from dlparkhurst/mix_error #350

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Job	Run time
build (macos-latest)	2m 59s
🚧⚫ mingw32	17s
build (ubuntu-latest)	2m 28s
build (windows-latest)	3m 4s
ctest (macos-latest)	1m 55s
ctest (ubuntu-latest)	2m 37s
ctest (windows-latest)	3m 15s
	16m 35s