CMake

Merge pull request #57 from dlparkhurst/viscosity #231

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Job	Run time
build (macos-latest)	1m 40s
build (ubuntu-latest)	2m 33s
🚧⚫ mingw32	17s
build (windows-latest)	3m 36s
ctest (macos-latest)	2m 5s
ctest (ubuntu-latest)	2m 10s
ctest (windows-latest)	2m 57s
	15m 18s