BUG: Fix numerous bugs related to zero-width string arrays (#473, #1901, #2196, #2585, #4955)

PyArray_NewFromDescr normally does not allow zero-width string dtypes (or rather, it automatically converts them to 1-width strings).  This affects any code that uses PyArray_NewFromDescr, which is a lot.  So we extend PyArray_NewFromDescr_int to allow disabling this functionality in a couple narrow cases where it's appropriate--one is when extracting a field from a structured array that has a zero-width string dtype (which, intentionally or not, has been allowed).  The other, which is related, is returning a view of an array that has a zero-width string dtype.  This shouldn't otherwise break or change any existing behavior.

Remove roadblocks to creating structured dtypes with zero-width fields using dict-based constructors (this was possible by other means such as the list-based constructor--with the previous fix in particular it should not be necessary to block this anymore).

Adds tests based on the tests cases given in the issues this is fixing.

Fix a bug with array to zero-width array assignment revealed by the tests.  I am slightly concerned that the blunt-force check for this in raw_array_assign_array may be masking a bug somewhere else though.

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