[instagram] add 'include' option (closes #1180)

Split the functionality of the old 'user' extractor into separate
'posts' and 'highlights' extractors, which respond to virtual URLs
('/<user>/posts' and '/<user>/highlights')

docs/configuration.rst

@@ -1045,15 +1045,22 @@ Description
     for details)
 
 
-extractor.instagram.highlights
-------------------------------
+extractor.instagram.include
+---------------------------
 Type
-    ``bool``
+    ``string`` or ``list`` of ``strings``
 Default
-    ``false``
+    ``"posts"``
+Example
+    ``"stories,highlights,posts"`` or ``["stories", "highlights", "posts"]``
 Description
-    Include *Story Highlights* when downloading a user profile.
-    (requires authentication)
+    A (comma-separated) list of subcategories to include
+    when processing a user profile.
+
+    Possible values are
+    ``"posts"``, ``"stories"``, ``"highlights"``, ``"channel"``.
+
+    You can use ``"all"`` instead of listing all values separately.
 
 
 extractor.instagram.videos

docs/supportedsites.rst

@@ -157,7 +157,7 @@ Turboimagehost       https://www.turboimagehost.com/     individual Images
 .. |furaffinity-C| replace:: Favorites, Galleries, Posts, Scraps, Search Results, User Profiles
 .. |hentaifoundry-C| replace:: Favorites, individual Images, Pictures, Popular Images, Recent Images, Scraps, Stories, User Profiles
 .. |imgur-C| replace:: Albums, Favorites, Galleries, individual Images, Search Results, Subreddits, Tag Searches, User Profiles
-.. |instagram-C| replace:: Channels, Posts, Saved Posts, Stories, Tag Searches, User Profiles
+.. |instagram-C| replace:: Channels, Highlights, Posts, Saved Posts, Stories, Tag Searches, User Profiles
 .. |newgrounds-C| replace:: Art, Audio, Favorites, individual Images, Media Files, Movies, User Profiles
 .. |nijie-C| replace:: Doujin, Favorites, Illustrations, individual Images, User Profiles
 .. |pixiv-C| replace:: Favorites, Follows, pixiv.me Links, Rankings, Search Results, User Profiles, individual Images