Boxes + horizontal flow makes for more readable call graphs #5836

Job	Run time
tests (ubuntu-latest, 3.8, data_dependency)	23s
tests (ubuntu-latest, 3.8, path_filtering)	28s
tests (ubuntu-latest, 3.8, erc)	24s
tests (ubuntu-latest, 3.8, find_paths)	22s
tests (ubuntu-latest, 3.8, flat)	28s
tests (ubuntu-latest, 3.8, interface)	23s
tests (ubuntu-latest, 3.8, printers)	1m 8s
tests (ubuntu-latest, 3.8, slither_config)	24s
tests (ubuntu-latest, 3.8, upgradability)	45s
tests (ubuntu-latest, 3.12, data_dependency)	25s
tests (ubuntu-latest, 3.12, path_filtering)	25s
tests (ubuntu-latest, 3.12, erc)	30s
tests (ubuntu-latest, 3.12, find_paths)	28s
tests (ubuntu-latest, 3.12, flat)	26s
tests (ubuntu-latest, 3.12, interface)	28s
tests (ubuntu-latest, 3.12, printers)	1m 5s
tests (ubuntu-latest, 3.12, slither_config)	28s
tests (ubuntu-latest, 3.12, upgradability)	52s
	9m 52s

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