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Update display widths as part of updating Unicode

Update display widths as part of updating Unicode

The hardcoded "wide character" set in ucs_wcwidth() was last updated
around the Unicode 5.0 era. This led to misalignment when printing
emojis and other codepoints that have since been designated
wide or full-width.

To fix and keep up to date, extend update-unicode to download the list
of wide and full-width codepoints from the offical sources.

In passing, remove some comments about non-spacing characters that
haven't been accurate since we removed the former hardcoded logic.

Jacob Champion

Reported and reviewed by Pavel Stehule
Discussion: https://www.postgresql.org/message-id/flat/CAFj8pRCeX21O69YHxmykYySYyprZAqrKWWg0KoGKdjgqcGyygg@mail.gmail.com

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