Bump minimum required cmake version to 3.10 & adopt policy CMP0167 #85

Job	Run time
build_cxx (latest, ubuntu-latest, false, false, false, false, false, false)	3m 13s
build_cxx (latest, ubuntu-latest, false, false, false, true, false, false)	4m 9s
build_cxx (latest, ubuntu-latest, true, false, false, false, false, false)	3m 20s
build_cxx (latest, macos-latest, false, false, false, false, false, false)	3m 52s
build_cxx (latest, macos-latest, false, true, false, false, false, false)	4m 30s
build_cxx (latest, macos-latest, true, false, false, false, false, false)	4m 12s
build_cxx (latest, windows-latest, false, false, false, false, false, false)	6m 59s
build_cxx (latest, windows-latest, true, false, false, false, false, false)	6m 2s
build_cxx (5.7.0, ubuntu-latest, false, false, false, false, false, false)	3m 25s
build_cxx (6.7.0, ubuntu-latest, false, false, false, false, false, false)	3m 28s
build_cxx (7.1.1, ubuntu-latest, false, false, false, false, false, false)	3m 24s
build_cxx (latest, ubuntu-latest, false, false, false, false, true, false)	4m 22s
build_cxx (6.7.0, ubuntu-latest, false, false, false, false, true, false)	4m 10s
build_cxx (7.1.1, ubuntu-latest, false, false, false, false, true, false)	4m 12s
build_cxx (latest, ubuntu-latest, false, false, false, false, false, true)	4m 2s
	1h 3m 20s

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