[twitter] add support for user-timelines (closes #96)

also adds a 'retweets' option to filter retweeted content

docs/configuration.rst

@@ -642,6 +642,15 @@ Description A (comma-separated) list of post types to extract images, etc. from.
 =========== =====
 
 
+extractor.twitter.retweets
+--------------------------
+=========== =====
+Type        ``bool``
+Default     ``true``
+Description Extract images from retweets.
+=========== =====
+
+
 extractor.[booru].tags
 ----------------------
 =========== =====

docs/gallery-dl.conf

@@ -107,6 +107,10 @@
             "posts": "photo",
             "reblogs": true
         },
+        "twitter":
+        {
+            "retweets": true
+        },
         "yandere":
         {
             "tags": false

docs/supportedsites.rst

@@ -76,7 +76,7 @@ SmugMug              https://www.smugmug.com/            |Albums, individ-5|
 Subapics             https://subapics.com/               Chapters, Manga
 The /b/ Archive      https://thebarchive.com/            Threads
 Tumblr               https://www.tumblr.com/             Images from Users, Likes, Posts, Tag-Searches      Optional (OAuth)
-Twitter              https://twitter.com/                Tweets
+Twitter              https://twitter.com/                Images from Users, Tweets
 Warosu               https://warosu.org/                 Threads
 World Three          http://www.slide.world-three.org/   Chapters, Manga
 XVideos              https://www.xvideos.com/            Images from Users, Galleries