CMake

Merge pull request #61 from dlparkhurst/viscosity #257

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Job	Run time
build (macos-latest)	1m 48s
build (ubuntu-latest)	2m 31s
build (windows-latest)	3m 54s
🚧⚫ mingw32	16s
ctest (macos-latest)	1m 28s
ctest (ubuntu-latest)	2m 12s
ctest (windows-latest)	3m 24s
	15m 33s