Smartypants/Smart Punctuation

Under macOS and iOS, there is a built-in setting that allows the replacement of quotes, and dashes for "curly" quotes, ndashes, and mdashes. That, of course, isn't available on Windows (I am not so sure on this one, because I don't use Windows), nor Linux. Would it be possible to have Phanpy handle those instead?

Reference: https://daringfireball.net/projects/smartypants/

No file, test, or entry point is named. Start by reviewing the issue's requested quote and dash replacements alongside the linked Smartypants reference; done means defining how Phanpy should handle those replacements on platforms without the macOS or iOS setting.

Written by the indexing model from the issue text.