message: Only include WorldBrowserModule in editor builds.
diff: #include "UObject/Class.h"
  #include "UObject/UnrealType.h"
  #include "VecMath.h"
  -#include "WorldBrowserModule.h"
  #include <glm/ext/matrix_transform.hpp>
  #include <glm/gtc/matrix_inverse.hpp>
  #include <glm/gtc/quaternion.hpp>
  #include "Editor.h"
  #include "EditorViewportClient.h"
  #include "Slate/SceneViewport.h"
  +#include "WorldBrowserModule.h"
  // These are in the Private directory, yet they are exported, so we're able to
  // use them. And there's no other way (AFAIK) to get details of unloaded levels.
  