message: Let callers control GenerateTimestamp
  As suggested by Ghabry in
diff: @@ -56,8 +56,6 @@ bool LSD_Reader::Save(const std::string& filename, const RPG::Save& save, const
  writer.WriteInt(header.size());
  writer.Write(header);
  - const_cast<RPG::Save&>(save).title.timestamp = GenerateTimestamp();
  -
  Struct<RPG::Save>::WriteLcf(save, writer);
  return true;
  }
  