CMake

Merge pull request #54 from dlparkhurst/viscosity #213

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Job	Run time
🚧⚫ mingw32	13s
build (macos-latest)	4m 41s
build (ubuntu-latest)	2m 28s
build (windows-latest)	3m 6s
ctest (macos-latest)	18m 24s
ctest (ubuntu-latest)	1h 7m 29s
ctest (windows-latest)	11m 0s
	1h 47m 21s