message: add XMP section 'subject' to keywords
diff: @@ -216,7 +216,11 @@ export class MetadataLoader {
  if (exif.Rating) {
  metadata.rating = (parseInt(exif.Rating.value, 10) as any);
  }
  -
  + if(exif.subject && exif.subject.value){
  + for(let i=0; i < exif.subject.value.length; i++){
  + metadata.keywords.push(exif.subject.value[i].value);
  + }
  + }
  if (exif.Orientation) {
  metadata.orientation = (parseInt(exif.Orientation.value as any, 10) as any);
  if (OrientationTypes.BOTTOM_LEFT < metadata.orientation) {
  