Add automodsumm_included_members option, take2 #185

Job	Run time
tests (Code style checks, ubuntu-latest, 3.x, codestyle)	32s
tests (ubuntu-latest, 3.8, py38-test-sphinx_oldest)	58s
tests (ubuntu-latest, 3.8, py38-test-sphinx53)	59s
tests (ubuntu-latest, 3.9, py39-test-sphinx62)	1m 1s
tests (ubuntu-latest, 3.9, py39-test-sphinx70)	1m 3s
tests (ubuntu-latest, 3.10, py310-test-sphinx71)	1m 6s
tests (ubuntu-latest, 3.11, py311-test-sphinx72-cov-clocale)	1m 13s
tests (ubuntu-latest, 3.12, py312-test-sphinxdev)	1m 19s
tests (macos-latest, 3.10, py310-test-sphinx72-clocale)	4m 25s
tests (macos-latest, 3.11, py311-test-sphinxdev)	4m 56s
tests (windows-latest, 3.8, py38-test-sphinx_oldest)	2m 22s
tests (windows-latest, 3.10, py310-test-sphinx72)	3m 9s
tests (windows-latest, 3.11, py311-test-sphinxdev)	3m 13s
	26m 16s

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