[iwara] update

- add 'include' docs
- simplify code for different result types
- provide 'count' and 'num' metadata
- remove 'search_type' metadata

docs/gallery-dl.conf

@@ -416,7 +416,9 @@
         "iwara":
         {
             "username": "",
-            "password": ""
+            "password": "",
+
+            "include": ["user-images", "user-images"]
         },
         "kemono":
         {