Diagnose unsupported overlaps between host- and command group accessors #114

Job	Run time
build (ubuntu-latest, Release, gcc)	2m 11s
build (ubuntu-latest, Release, clang)	3m 42s
build (ubuntu-latest, Debug, gcc)	1m 56s
build (ubuntu-latest, Debug, clang)	3m 9s
build (windows-latest, Release, cl)	3m 11s
build (windows-latest, Debug, cl)	28m 26s
build (macos-latest, Release, gcc)	5m 5s
build (macos-latest, Debug, gcc)	3m 56s
	51m 36s

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