Function: curly_quotes

--Usage--
> curly_quotes(some_tagged_string)

Make quotes 'curly'.
Single and double quotation marks are changed to opening or closing versions depending on where they appear in the text.

--Parameters--
! Parameter	Type			Description
| @input@	[[type:tagged string]]	String to make quotes curly in.

--Examples--
>>> curly_quotes("He said: 'This is cool!', she said: \"No way!\" ")
>>>   ==  "He said: ‘This is cool!’, she said: “No way!” "
>>> curly_quotes("Also: ’Wrong quotes‘ ")
>>>   ==  "Also: ‘Wrong quotes’ "