The Unicode Consortium's text-rendering tests for AAT morx: the MORX-1 to
MORX-42 cases (tests/) and the fonts they name (fonts/), unmodified, as
HarfBuzz keeps them at its 14.5.0 tag, which is the release the oracle is
pinned to:

  https://github.com/harfbuzz/harfbuzz/tree/14.5.0/test/shape/data/text-rendering-tests

HarfBuzz imports them from https://github.com/unicode-org/text-rendering-tests.
They are under the Apache License 2.0; see COPYING, and THIRD_PARTY_NOTICES at
the root of the repository.

morx.py shapes every case with HarfBuzz and writes morx.expected.txt, which
shape/morx_test.go holds the morx reader to.
