Handle \N numbered character escapes the same way as groff:

If \N is followed by a digit, ignore \N and the digit.
If \N is followed by a non-digit, the next non-digit
ends the character number; the two delimiters need not match.
Kristaps calls that "gross, but not our fault".

For now, i'm fixing \N only.  Other escapes taking numeric arguments
may or may not need similar handling, but \N is by far the most
important for practical purposes.

ok kristaps@

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