[mb-style] Use of ‘fancy’ punctuation characters

[Per Starbäck]

At least Bogdan Butnaru has planned to write typography assisting
software. See http://musicbrainz-mailing-lists.2986109.n2.nabble.com/Mechanically-assisted-updating-of-typography-on-MusicBrainz-td5978214.html
from early this year.

> song's title      →   song’s title
> a 'quoted' text   →   a ‘quoted’ text
> in the '90s       →   in the ’90s
> rock 'n' roll     →   rock ’n’ roll

And since actual use often is "erroneous" for apostrophe at the
beginning, with spellings like Rock ‘n’ Roll (I've given examples in
http://musicbrainz-mailing-lists.2986109.n2.nabble.com/Ellipses-quotation-marks-and-the-miscellaneous-guideline-td5734079i20.html#a5769484
) I think a style guide should explicitly mention if that should be
"corrected" (my opinion) or not.

>> The hyphen thing is harder, because AFAIK there's no way
>> to actually see the difference (at least in the standard
>> font MB uses) so they're kinda hard to vote on anyway.

Hopefully these will become autoedits anyway. My preference is that if
you enter titles and names with ambiguous ASCII characters there
should somewhere on the screen appear something like

  The character - is ambigous. It is usually a hyphen for hyphenated
words, but sometimes a dash
  or a minus sign. If you are unsure just leave it as it is.
  [hyphen]   [en dash]   [em dash]   [minus]