docs - first chunk of work documenting the files I glossed over (#2130)

- started documenting the files I glossed over, some are totally done,
others are just partially done
- I changed the decompiler to automatically initialize the
art-group-info from the json file. This makes updating gsrc, even a
single file at a time, have consistent naming
- Though I disabled this functionality for jak 1, as I have no idea if
using the ntsc art groups will cause a regression for different versions
- fix indentation for docstrings -- it still doesn't look great, but
this is now a formatting concern, rather than the docstring having a
bunch of happen-stance leading whitespace.

decompiler/config.cpp

@@ -52,6 +52,14 @@ Config read_config_file(const fs::path& path_to_config_file, const std::string&
   config.streamed_audio_file_names =
       inputs_json.at("streamed_audio_file_names").get<std::vector<std::string>>();
 
+  if (cfg.contains("art_group_dump_file")) {
+    auto json_data = file_util::read_text_file(
+        file_util::get_file_path({cfg.at("art_group_dump_file").get<std::string>()}));
+    std::unordered_map<std::string, std::unordered_map<int, std::string>> serialized =
+        parse_commented_json(json_data, "art_group_dump_file");
+    config.art_group_info_dump = serialized;
+  }
+
   if (cfg.contains("obj_file_name_map_file")) {
     config.obj_file_name_map_file = cfg.at("obj_file_name_map_file").get<std::string>();
   }