An interchange law for squares and cleanups to Cubical/PathSquare.v #3893

Job	Run time
opam-build (dev, ubuntu-latest)	3m 56s
opam-build (latest, ubuntu-latest)	4m 44s
opam-build (supported, ubuntu-latest)	4m 48s
quick-build (supported, ubuntu-latest)	3m 26s
quick-build (dev, ubuntu-latest)	3m 13s
build (dev, --warnings)	3m 46s
nix	2m 12s
build (supported)	3m 43s
build (latest)	3m 21s
quick-build (latest, ubuntu-latest)	3m 21s
doc-dep-graphs	7m 44s
doc-coqdoc	1m 42s
doc-timing	2m 1s
coqchk (supported)	2m 8s
install (supported)	1m 53s
coqchk (latest)	1m 59s
coqchk (dev)	2m 4s
install (latest)	1m 52s
doc-alectryon	15m 32s
install (dev)	1m 59s
deploy-doc	0s
delete-artifacts	10s
	1h 15m 34s

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