An interchange law for squares and cleanups to Cubical/PathSquare.v #3883

Job	Run time
opam-build (dev, ubuntu-latest)	4m 35s
quick-build (latest, ubuntu-latest)	3m 25s
opam-build (supported, ubuntu-latest)	4m 10s
opam-build (latest, ubuntu-latest)	4m 31s
quick-build (supported, ubuntu-latest)	3m 27s
build (latest)	3m 20s
quick-build (dev, ubuntu-latest)	3m 29s
nix	2m 14s
build (supported)	4m 0s
build (dev, --warnings)	3m 42s
doc-alectryon	15m 44s
doc-dep-graphs	8m 12s
doc-coqdoc	1m 42s
install (dev)	1m 45s
install (latest)	1m 57s
install (supported)	1m 44s
coqchk (dev)	1m 59s
doc-timing	1m 52s
coqchk (supported)	2m 12s
coqchk (latest)	2m 10s
delete-artifacts	10s
deploy-doc	0s
	1h 16m 20s

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