Add some more publish warnings

[mdirolf]

This can be broken out into separate issues if needed (or tackled one at a time!) but just listing here since I've thought of a few:

• [ ] Unches when no "cryptic" tag is present (use hasUnches in gridBase.ts)
• [ ] Two-letter words

These two are a bit more complex:

• [ ] A clue has something that looks like a reference (e.g. 39-Across) but there is no matching entry
• [ ] Clues all end in enumerations (e.g. (4) or (2, 3) or (5, two words)) but one is missing
• [ ] Clues all end in enumerations but one (or more) doesn't match the length of the entry

[legnes]

Another thing that came up when discussing enumerations was adding a button to append them to all clues, and possibly also a button to undo or remove them. Possibly that should be its own issue/feature, but mentioning it here just to make sure it's written down!