STYLE: One declaration per line for readability #756

Job	Run time
build-test-documentation (ubuntu-22.04)	6h 0m 13s
build-test-cxx (ubuntu-22.04)	11m 27s
build-test-cxx (windows-2022)	11m 9s
build-test-notebooks (ubuntu-22.04)	2m 13s
build-test-cxx (macos-13)	1s
build-test-notebooks (windows-2022)	4m 12s
build-test-notebooks (macos-13)	1s
build-test-python-superbuild (ubuntu-22.04)	12m 14s
build-test-python-superbuild (windows-2022)	11m 55s
build-test-python-superbuild (macos-12)	1s
	6h 53m 26s

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