RCPP-41 Add Conan support #65

Job	Run time
build (ubuntu-latest, Debug, True)	11m 27s
build (ubuntu-latest, Debug, False)	11m 31s
build (ubuntu-latest, Release, True)	9m 32s
build (ubuntu-latest, Release, False)	9m 21s
build (windows-latest, Debug, True)	19m 21s
build (windows-latest, Debug, False)	20m 10s
build (windows-latest, Release, True)	12m 24s
build (windows-latest, Release, False)	12m 32s
build (macos-latest, Debug, True)	15m 41s
build (macos-latest, Debug, False)	7m 16s
build (macos-latest, Release, True)	15m 23s
build (macos-latest, Release, False)	7m 28s
	2h 32m 6s

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