message: Use proper includes for FactoryProduction
diff: #pragma once
  -#include "UI.h"
  +#include "Core/Window.h"
  +#include "Core/Button.h"
  +#include "Core/CheckBox.h"
  #include "IconGrid.h"
  #include "../Constants.h"
  #include "../Things/Structures/Factory.h"
  +
  /**
  * \brief Implements a Factory Production dialog interface.
  */
  