[weasyl] api-key authentication (#1057)

* [weasyl] support api keys

* [weasyl] document api-key authentication

* [weasyl] usernames can contain ~

docs/configuration.rst

@@ -1497,6 +1497,16 @@ Description
     See https://wallhaven.cc/help/api for more information.
 
 
+extractor.weasyl.api-key
+Type
+    ``string``
+Default
+    ``null``
+Description
+    Generate an API key at https://www.weasyl.com/control/apikeys
+    Set this field in your config to the value of that key.
+
+
 extractor.weibo.retweets
 ------------------------
 Type

docs/supportedsites.rst

@@ -128,7 +128,7 @@ Twitter              https://twitter.com/                |twitter-C|
 VSCO                 https://vsco.co/                    Collections, individual Images, User Profiles
 Wallhaven            https://wallhaven.cc/               individual Images, Search Results                  Optional (`API Key <configuration.rst#extractorwallhavenapi-key>`__)
 Warosu               https://warosu.org/                 Threads
-Weasyl               https://www.weasyl.com/             Favorites, Folders, Journals, Submissions
+Weasyl               https://www.weasyl.com/             Favorites, Folders, Journals, Submissions          Optional
 Webtoon              https://www.webtoons.com/           Comics, Episodes
 Weibo                https://www.weibo.com/              Images from Statuses, User Profiles
 WikiArt.org          https://www.wikiart.org/            Artists, Artist Listings, Artworks