private void CopyMainImages(IEnumerable <Entity> entities, string inputPath, string outputPath)
{
//build the mod input list
var inputDirectories = StellarisDirectoryHelper
.CreateCombinedList(StellarisDirectoryHelper, modDirectoryHelpers, Last)
.Select(x => Path.Combine(x.Icons, inputPath)).ToList();
// tech images
ImageOutput.TransformAndOutputImages(inputDirectories, Path.Combine(outputRoot, outputPath), entities);
}