provide type information for Queue messages

Child extractors are now directly constructed with Extractor.from_url()
if the extractor class is known beforehand, instead of using
extractor.find() and searching through all possible extractor classes.

gallery_dl/extractor/luscious.py

@@ -199,4 +199,5 @@ class LusciousSearchExtractor(LusciousExtractor):
             "count": text.parse_int(count),
             "date": date,
             "tags": text.remove_html(tags.partition(">")[2]),
+            "_extractor": LusciousAlbumExtractor,
         }