An interchange law for squares and cleanups to Cubical/PathSquare.v #3884

Job	Run time
quick-build (latest, ubuntu-latest)	3m 29s
opam-build (latest, ubuntu-latest)	4m 30s
opam-build (dev, ubuntu-latest)	4m 39s
opam-build (supported, ubuntu-latest)	4m 50s
build (latest)	3m 49s
quick-build (dev, ubuntu-latest)	3m 43s
quick-build (supported, ubuntu-latest)	3m 26s
build (dev, --warnings)	3m 59s
build (supported)	3m 40s
nix	2m 18s
doc-alectryon	15m 32s
doc-dep-graphs	7m 52s
coqchk (dev)	1m 57s
coqchk (latest)	2m 6s
coqchk (supported)	2m 7s
install (latest)	1m 46s
doc-coqdoc	1m 48s
install (dev)	1m 41s
doc-timing	1m 47s
install (supported)	1m 55s
deploy-doc	0s
delete-artifacts	12s
	1h 17m 6s

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