rokojori_action_library/Runtime/App/Settings/AppSettings.cs

using Godot;
using System.Collections.Generic;

namespace Rokojori
{  
  [Tool]
  [GlobalClass]
  public partial class AppSettings:Resource
  {
    [Export]
    public AppSettingsCategory[] categories = [];

    public void ApplySetting( App app, string key, string value )
    {
      app.SetSetting( key, value );
      categories.ForEach(
        ( c )=>
        {
          c.settings.ForEach(
            ( s)=>
            {
              if ( s.id != key )
              {
                return;
              }

              s.ApplyValue( app );
            }
          );
        }
      );
    }
  }
}