An interchange law for squares and cleanups to Cubical/PathSquare.v #3892

Job	Run time
quick-build (dev, ubuntu-latest)	3m 21s
opam-build (dev, ubuntu-latest)	4m 5s
quick-build (latest, ubuntu-latest)	3m 29s
opam-build (supported, ubuntu-latest)	4m 58s
build (supported)	3m 45s
nix	2m 14s
build (dev, --warnings)	3m 27s
quick-build (supported, ubuntu-latest)	3m 39s
build (latest)	3m 47s
opam-build (latest, ubuntu-latest)	4m 53s
doc-dep-graphs	7m 56s
doc-alectryon	14m 28s
doc-timing	1m 48s
doc-coqdoc	1m 36s
install (supported)	1m 52s
install (latest)	1m 52s
coqchk (latest)	2m 20s
install (dev)	1m 53s
coqchk (supported)	2m 19s
coqchk (dev)	2m 0s
deploy-doc	0s
delete-artifacts	9s
	1h 15m 51s

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