Build

Use stairtype setting when designating a single-layer staircase #6132

Job	Run time
lint / lint	21s
docs / Build linux64	36s
test / Windows MSVC / Build win64	2m 44s
test / Linux gcc-11 / Build linux64	1m 3s
test / Linux gcc-12 / Build linux64	1m 12s
test / Run Linux test suite (gcc-12, all plugins)	0s
test / Run Linux test suite	0s
test / Run Windows test suite	0s
test / Run Windows test suite (empty config)	0s
	5m 56s

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