vendor: 引入 Lua 3.2 官方源码 + 移植评估 (lua_3.2 分支)

- 前 lua_State 时代 API(全局单例状态机), 与项目多实例+管道模式抽象冲突
- 评估结论: 不建议移植, 详见 doc/ADAPTATION-lua32.md

lib/lua/README

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+This is Lua 3.2
+
+* What is Lua?
+  ------------
+  Lua is a programming language originally designed for extending applications,
+  but also frequently used as a general-purpose, stand-alone language.
+  Lua combines simple procedural syntax (similar to Pascal) with powerful
+  data description constructs based on associative arrays and extensible
+  semantics. Lua is dynamically typed, interpreted from bytecodes, and has
+  automatic memory management, making it ideal for configuration, scripting,
+  and rapid prototyping.
+
+  Lua is implemented as a small library of C functions, written in ANSI C,
+  and compiles unmodified in all known platforms. The implementation goals
+  are simplicity, efficiency, portability, and low embedding cost.
+
+  Lua was awarded the first prize (technological category) in the Second Compaq 
+  Award for Research and Development in Computer Science in 1997. This award
+  is a joint venture of Compaq Computer in Brazil, the Brazilian Ministry of
+  Science and Technology, and the Brazilian Academy of Sciences.
+
+* Availability
+  ------------
+  Lua is freely available for both academic and commercial purposes and
+  can be downloaded from the sites below. See COPYRIGHT for details.
+
+    Home page:	http://www.tecgraf.puc-rio.br/lua/
+		http://csg.uwaterloo.ca/~lhf/lua/
+    In Brazil:	ftp://ftp.tecgraf.puc-rio.br/pub/lua/lua.tar.gz
+    In Canada:	ftp://csg.uwaterloo.ca/pub/lhf/lua/lua.tar.gz
+    In the US:	ftp://ftp.cdrom.com/pub/languages/lua/lua.tar.gz
+    In Germany:	ftp://ftp.uni-trier.de/pub/languages/lua/lua.tar.gz
+    In Germany: ftp://ftp.gwdg.de/pub/languages/lua/lua.tar.gz
+    In Greece:	ftp://ftp.ntua.gr/pub/lang/lua/lua.tar.gz
+
+* Installation
+  ------------
+  See INSTALL.
+
+* Contacting the authors
+  ----------------------
+  Lua has been designed and implemented by Waldemar Celes,
+  Roberto Ierusalimschy and Luiz Henrique de Figueiredo.
+  They can be contacted by email at lua@tecgraf.puc-rio.br. 
+
+  Send your comments, bug reports and anything else to lua@tecgraf.puc-rio.br.
+  For reporting bugs, try also the mailing list: lua-l@tecgraf.puc-rio.br.
+  To subscribe to this list, send "subscribe lua-l YOUR-NAME" to
+  listproc@tecgraf.puc-rio.br in the body of the message (not in the subject).
+
+  Lua has been developed at TeCGraf, the Computer Graphics Technology Group
+  of PUC-Rio (the Pontifical Catholic University of Rio de Janeiro in Brazil). 
+  TeCGraf is a laboratory of the Department of Computer Science.
+  Dozens of industrial products developed by TeCGraf use Lua.