CMake

Merge pull request #65 from dlparkhurst/viscosity #269

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Job	Run time
🚧⚫ mingw32	18s
build (macos-latest)	1m 40s
build (ubuntu-latest)	2m 31s
build (windows-latest)	4m 12s
ctest (macos-latest)	3m 3s
ctest (ubuntu-latest)	2m 16s
ctest (windows-latest)	3m 22s
	17m 22s