An interchange law for squares and cleanups to Cubical/PathSquare.v #3896

Job	Run time
quick-build (dev, ubuntu-latest)	4m 1s
opam-build (dev, ubuntu-latest)	4m 8s
quick-build (latest, ubuntu-latest)	3m 37s
opam-build (supported, ubuntu-latest)	4m 35s
opam-build (latest, ubuntu-latest)	4m 36s
quick-build (supported, ubuntu-latest)	3m 31s
nix	2m 14s
build (supported)	3m 37s
build (latest)	3m 42s
build (dev, --warnings)	3m 48s
doc-timing	1m 47s
doc-dep-graphs	7m 49s
doc-alectryon	15m 24s
coqchk (latest)	2m 9s
install (supported)	1m 48s
coqchk (supported)	2m 28s
doc-coqdoc	1m 57s
install (dev)	2m 3s
install (latest)	1m 46s
coqchk (dev)	1m 56s
delete-artifacts	7s
deploy-doc	-1s
	1h 17m 2s

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