Changed a LOT. Notable changes:
* Removed decorators, as they're not that useful, unless rewriting most
Lua libraries API.
* Added functions parameters default values.
* Added Lua 5.3 stuff and building to Lua 5.1.
* Remplaced the LuaMinify parser by lua-parser. It now requires some
non-Lua dependencies (LPeg) unfortunately, but it's waaaaaay easier to
handle. Code should be adaptable to any Metalua-like AST generator
anyway.
* The generated code now look like shit, and comment are stripped,
because the parser ignore them. Oh well.
* Changed a few things in the preprocessor environment.
* Nobody will read this commit message I guess. If you did, create an
issue saying "I love pineapple flavored bread".
