An interchange law for squares and cleanups to Cubical/PathSquare.v #3888

Job	Run time
quick-build (dev, ubuntu-latest)	3m 22s
quick-build (supported, ubuntu-latest)	3m 19s
opam-build (latest, ubuntu-latest)	4m 40s
quick-build (latest, ubuntu-latest)	3m 29s
opam-build (supported, ubuntu-latest)	4m 51s
build (supported)	3m 37s
build (latest)	3m 35s
build (dev, --warnings)	4m 41s
opam-build (dev, ubuntu-latest)	4m 26s
nix	2m 15s
doc-dep-graphs	7m 57s
doc-coqdoc	1m 48s
coqchk (latest)	2m 21s
coqchk (dev)	2m 2s
coqchk (supported)	2m 16s
doc-alectryon	15m 23s
install (latest)	1m 47s
install (supported)	1m 38s
install (dev)	2m 0s
doc-timing	1m 46s
deploy-doc	0s
delete-artifacts	9s
	1h 17m 22s

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