Recognize equivalence classes when parsing numbers

Deleted Component: formatting

ICU currently doesn't recognize equivalence classes of punctuation when parsing
numbers. We received this bug report from a developer:

ICU/CFNumberFormatter does not recognize characters other than U+002D as minus
signs. The Unicode standard has several other minus signs, such as U+2212,
U+FE63, and U+FF0D. This causes problems with Japanese input in particular,
because with many Japanese input methods, hitting the minus sign on the keyboard
next to 0 (not the minus sign on the numeric keypad) results in the character
U+2212 being inserted.

(Deborah again) This probably applies to periods, commas, etc. as well. It's
better to be forgiving when parsing.