message: fixed compilation on engine < 4.16
diff: @@ -44,7 +44,14 @@ static PyObject *py_ue_simage_set_texture(ue_PySImage *self, PyObject * args) {
  tint = py_color->color;
  }
  +#if ENGINE_MINOR_VERSION > 15
  self->brush = FSlateImageBrush(texture, FVector2D(texture->GetSurfaceWidth(), texture->GetSurfaceHeight()), tint);
  +#else
  + self->brush = FSlateBrush();
  + self->brush.ImageSize = FVector2D(texture->GetSurfaceWidth(), texture->GetSurfaceHeight());
  + self->brush.SetResourceObject(texture);
  + self->brush.TintColor = tint;
  +#endif
  sw_image->SetImage(&self->brush);
  