An interchange law for squares and cleanups to Cubical/PathSquare.v #3894

Job	Run time
quick-build (latest, ubuntu-latest)	3m 21s
opam-build (dev, ubuntu-latest)	4m 20s
build (latest)	3m 47s
quick-build (dev, ubuntu-latest)	3m 19s
opam-build (supported, ubuntu-latest)	4m 40s
build (dev, --warnings)	4m 1s
quick-build (supported, ubuntu-latest)	3m 39s
opam-build (latest, ubuntu-latest)	4m 8s
nix	2m 18s
build (supported)	3m 44s
coqchk (dev)	1m 54s
doc-dep-graphs	7m 44s
doc-alectryon	14m 31s
doc-coqdoc	1m 46s
doc-timing	1m 58s
coqchk (supported)	2m 21s
coqchk (latest)	2m 15s
install (supported)	1m 51s
install (latest)	1m 41s
install (dev)	1m 56s
delete-artifacts	8s
deploy-doc	0s
	1h 15m 22s

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