CMake

Merge pull request #85 from dlparkhurst/mix_error #363

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Job	Run time
build (macos-latest)	1m 58s
🚧⚫ mingw32	16s
build (ubuntu-latest)	2m 36s
build (windows-latest)	3m 51s
ctest (macos-latest)	1m 50s
ctest (ubuntu-latest)	2m 7s
ctest (windows-latest)	3m 19s
	15m 57s