RCPP-41 Add Conan support #58

Job	Run time
build (ubuntu-latest, Debug, True)	11m 21s
build (ubuntu-latest, Debug, False)	12m 0s
build (ubuntu-latest, Release, True)	9m 53s
build (ubuntu-latest, Release, False)	9m 1s
build (windows-latest, Debug, True)	19m 11s
build (windows-latest, Debug, False)	19m 19s
build (windows-latest, Release, True)	13m 5s
build (windows-latest, Release, False)	12m 17s
build (macos-latest, Debug, True)	8m 46s
build (macos-latest, Debug, False)	9m 29s
build (macos-latest, Release, True)	9m 30s
build (macos-latest, Release, False)	9m 41s
	2h 23m 33s

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