CMake

Merge pull request #56 from dlparkhurst/viscosity #229

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Job	Run time
build (macos-latest)	1m 53s
🚧⚫ mingw32	18s
build (ubuntu-latest)	2m 34s
build (windows-latest)	3m 48s
ctest (macos-latest)	1m 30s
ctest (ubuntu-latest)	2m 7s
ctest (windows-latest)	3m 37s
	15m 47s