code: def _makeScriptOrder(gpos):
      
      scripts = []
      for scriptRecord in gpos.ScriptList.ScriptRecord:
          scripts.append(scriptRecord.ScriptTag)
      if "DFLT" in scripts:
          scripts.remove("DFLT")
          scripts.insert(0, "DFLT")
      return sorted(scripts)
docs: Run therough GPOS and make an alphabetically
      ordered list of scripts. If DFLT is in the list,
      move it to the front.