[YouPorn] Add playlist extractors

* YouPornCategoryIE
* YouPornChannelIE
* YouPornCollectionIE
* YouPornStarIE
* YouPornTagIE
* YouPornVideosIE,

Author: dirkf

youtube_dl/extractor/extractors.py

@@ -1653,7 +1653,15 @@
     YouNowChannelIE,
     YouNowMomentIE,
 )
-from .youporn import YouPornIE
+from .youporn import (
+    YouPornIE,
+    YouPornCategoryIE,
+    YouPornChannelIE,
+    YouPornCollectionIE,
+    YouPornStarIE,
+    YouPornTagIE,
+    YouPornVideosIE,
+)
 from .yourporn import YourPornIE
 from .yourupload import YourUploadIE
 from .youtube import (