Detect Nonstandard Submodules #1345

Job	Run time
lint / tox	36s
build / build	11s
test (macos-latest, 3.12.0, --cov-fail-under=100) / tox	3m 29s
test (ubuntu-latest, 3.11.5) / tox	2m 18s
test (ubuntu-latest, 3.10.13) / tox	2m 29s
test (ubuntu-latest, 3.8.18) / tox	1m 35s
test (ubuntu-latest, 3.12.0, --cov-fail-under=100) / tox	2m 43s
test (windows-latest, 3.12.0, --cov-fail-under=100) / tox	3m 13s
test (ubuntu-latest, 3.9.18) / tox	2m 22s
check / check	2s
deploy	0s
	18m 58s

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