CMake

Merge pull request #66 from dlparkhurst/viscosity #274

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Job	Run time
build (macos-latest)	1m 54s
🚧⚫ mingw32	12s
build (ubuntu-latest)	2m 26s
build (windows-latest)	3m 32s
ctest (macos-latest)	2m 31s
ctest (ubuntu-latest)	2m 16s
ctest (windows-latest)	3m 29s
	16m 20s