Flatsharp codegen (#326)

* Manually translated/attributed fbs files.

* Include fields in obj-as-table dump

* Emit fields for json too. FlatSharp generates structs with fields rather than properties at fixed offsets (maybe I'm missing a setting)

* Update .editorconfig to ignore generated code files (unsure if this actually works).

pkNX.Containers/VFS/FileSystems/LayeredFileSystem.cs

@@ -72,7 +72,7 @@ public Stream OpenFile(FileSystemPath path, FileAccess access)
     {
         IFileSystem? fs = GetFirst(path);
         if (fs == null)
-            throw new FileNotFoundException();
+            throw new FileNotFoundException($"Unable to find {path.Path}");
         return fs.OpenFile(path, access);
     }