feat!: Additional Lua bindings, documentation, attitude decoupled from creature

[AluminumAlman]

Summary

SUMMARY: Infrastructure "More game, mostly creature class-family's, functions/methods exposed to Lua. Additional documentation added for Lua. Decoupled creature attitude from creature header. Incremented internal Lua version constant to 2."

Purpose of change

Building on top of #2216, a whole bunch of functions for creature, character, avatar and NPC are now exposed to Lua, with other bindings in order for the aforementioned bindings to work, and a few other miscellaneous bindings.
Added docs for binding Lua classes/structs by transforming the definition.
As suggested by olanti-p, I've decoupled the creature attitude enum from its class so as not to include the massive creature.h file in catalua files.

Describe the solution

In order to bind most of the creature class family's methods and members to Lua, the types used/returned had to be bound to Lua first, which required additions to them, most of them covered by doc/LUA_SUPPORT.md. By using (mostly) regex, header files of the classes in question were formatted step-by-step so that it wouldn't be as tedious as doing it manually, however looking over the result was necessary sometimes. Preprocessor macros were made to make typing bindings manually less of a hassle when the regex processing didn't work.
Writing Lua bindings by hand can be quite cumbersome and tedious, so through the use of macros and regular expression substitution on a class definition, binding large classes/structs shouldn't be as awful.
The creature attitude enum is now a part of enums.h file. Additionally, a enum_conversions.cpp file was created to have the enum_to_string<Attitude> needed for Lua bindings.

Testing

• Project builds (on my machine);
• Ran some bound functions through the Lua console to make sure that they worked;
• Changed/added a little bit of tests;
• Current tests may be lacking (e. g. no creature class family tests);

Additional context

• Remake of feat(lua): additional, mostly creature class family, bindings #3170 as the branch was failing to build after merge conflict fix because of the PR's staleness.
• Some of the bindings are commented out, whether it be because they are unnecessary, throw errors when building or "I did not want to confuse Lua modders with too many bindings" (I was lazy to uncomment them). If need be, those can (hopefully) be uncommented easily.
• Additional images:
  
  
  
  

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[scarf005]

feat!: Additional Lua bindings, documentation, attitude decoupled from creature

Would it be possible to list commits or changes for attitude decoupled from creature? As this is a huge change , Splitting this PR into two step would make it easier to review, e.g)

1. refactor: decouple attitude from creature
2. feat!: additional lua bindings
   huge

[AluminumAlman]

Splitting this PR into two per request of scarf005.