platform independent, header only, wcwidth with full unicode 9 support
This code is primarily derived from the neovim project. The tables were produced from parsing the official unicode files EastAsianWidth.txt and emoji-data.txt using genunicodetables.lua.
Simply include wcwidth9.h in your project and use the wcwidth9 function. It works just like wcwidth.
The input value c is expected to be a unicode code point value. The widths returned are according to unicode version 9.0.0.
Return values:
1 or 2: the width of the character-1: non-printable, combining or unassigned character-2: ambiguous width character-3: private-use characterAmbiguous width characters should almost always be considered width 1 except in the context of some East Asian languages as described here.
As private-use characters may not necessarily need to vary depending on East Asian context, but are still considered ambiguous, a separate return value is provided to distinguish them.
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