utf16

Forked from https://github.com/vtudorache/lua-utf16

This library provides minimal support for the UTF-16 encoding. Operations
that query the meaning of a character, such as character classification,
are outside its scope. Since strings in Lua can have embedded zeros, the
library uses the default Lua string type to hold the UTF-16 data. The
encoding of a particular string is the user's responsibility.