RCPP-41 Add Conan support #63

Job	Run time
build (ubuntu-latest, Debug, True)	11m 26s
build (ubuntu-latest, Debug, False)	11m 17s
build (ubuntu-latest, Release, True)	9m 42s
build (ubuntu-latest, Release, False)	9m 19s
build (windows-latest, Debug, True)	20m 53s
build (windows-latest, Debug, False)	18m 42s
build (windows-latest, Release, True)	13m 20s
build (windows-latest, Release, False)	13m 17s
build (macos-latest, Debug, True)	13m 33s
build (macos-latest, Debug, False)	6m 27s
build (macos-latest, Release, True)	7m 45s
build (macos-latest, Release, False)	8m 11s
	2h 23m 52s

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