luatexja-fontspec-24.sty: YokoFeatures etc. inside AltFont

luatexja-fontspec-24.sty: YokoFeatures etc. inside AltFont

e.g.:
\jfontspec
[
  AltFont = { { Color=0000FF,  Range="6000-"9FFF } },
  BoldFont=KozMinPr6N-Bold,
  UprightFeatures = {
    AltFont = {
      { Font=KozGoPr6N-Light, Range="3000-"30FF, TateFont = KozGoPr6N-Heavy,
        YokoFeatures={ Color=4F0000} }
    },
  },
  BoldFeatures = { Color=006F00,
    AltFont = { { Font=KozGoPr6N-Bold, Range="3000-"30FF } },
  },
]{KozMinPr6N-Light}

Now AltFont stacks with \addjfontfeatures.