allowed flex to accept lists

[ckavanagh21]

changed "wrap" and "direction" to allow lists instead of just strings
closes #1494
closes #1495

I also wanted to point out that one of the tests is failing, but I'm unsure if it's relevant to my changes. It has to do with a syntax error in a completely different file. Here's the output:
=============================================== short test summary info =============================================== FAILED tests/test_model.py::test_automigration - sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) near "DROP": syntax error ============================================ 1 failed, 529 passed in 6.52s ============================================

Not sure if that's relevant, but I wanted to point it out.

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[masenf]

"DROP": syntax error

This is a result of running python built against sqlite < 3.35 where ALTER TABLE ... DROP COLUMN support was added. See discussion in #1356. Safe to ignore.

[masenf]

fixed via #1553