CMake

Some cleanup and improvements, added benchmarks. #116

Job	Run time
build (ubuntu-latest)	1m 27s
build (windows-latest)	2m 26s
build (macos-latest)	1m 58s
Format Check	19s
benchmark (macos-latest)	14s
test (macos-latest)	14s
benchmark (windows-latest)	46s
test (ubuntu-latest)	10s
benchmark (ubuntu-latest)	5s
test (windows-latest)	45s
cleanup_cache (ubuntu-latest)	2s
cleanup_cache (macos-latest)	4s
cleanup_cache (windows-latest)	16s
	8m 46s

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