This module adds UTF-8 support to Lua. It use data extracted from
Unicode Character Database, and tested on Lua 5.2.3, Lua 5.3.0 and LuaJIT.
parseucd.lua is a pure Lua script generate unidata.h, to support convert
characters and check characters' category. It mainly used to compatible
with Lua's own string module, it passed all string and pattern matching
test in lua test suite2.