New setting to expand identifier / name / word and/or consolidation of constant

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Some Lua based domain specific languages use an extended character set for identifiers, this is easily achieved by modifying e.g. alnum in luaconf.h, similar in LuaJIT and also is adjustable through compact modifications in ZeroBrane.

In Sumneko it was easy to modify as well until recently (through parser/grammar.lua), but with the latest patch the definition of which characters an identifier/word/lua-name represents is all over the place.

- newparser.lua - CharMapWord,
- grammar.lua - defs.NameBody
- luadoc.lua - name
- tokens.lua - Word

As sample e.g. adding support for $ and @ characters in the identifiers: \x24-\x24 and \x40-\x40 or the single character versions are added to the listings.

It would be better to have a extension setting where this can be listed, or alternatively at least a single file where this is defined as constant (similar to how its able to be overridden/extended through luaconf.h)

首先比较 newparser.lua、grammar.lua、luadoc.lua 和 tokens.lua 中的标识符定义，尤其是 CharMapWord、defs.NameBody、name 和 Word。确定所请求的扩展设置或共享常量是否可以覆盖这四处，然后验证 $ 和 @ 等字符是否能被一致地识别。

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