1986ffba

Author: Michael Lynch <3050084-mtlynch@users.noreply.gitlab.com>

Merge branch 'water-stairs' into 'master'

Connect staircase cascades through their empty corner cells

See merge request mtlynch/mikeville!18
check-bashcheck-elixircheck-frontendcheck-trailing-newlinecheck-trailing-whitespacedefaulte2e-testsconfiguredevShellx86_64-linuxcheck-bashcheck-elixircheck-frontendcheck-trailing-newlinecheck-trailing-whitespacedefaulte2e-testsmikevillex86_64-linux