[wikimedia] update

- rewrite using BaseExtractor
- support most Wiki* domains
- update docs/supportedsites
- add tests

docs/supportedsites.md

@@ -1478,6 +1478,64 @@ Consider all listed sites to potentially be NSFW.
     <td></td>
 </tr>
 
+<tr>
+    <td colspan="4"><strong>Wikimedia Instances</strong></td>
+</tr>
+<tr>
+    <td>Wikipedia</td>
+    <td>https://www.wikipedia.org/</td>
+    <td>Articles, Categories</td>
+    <td></td>
+</tr>
+<tr>
+    <td>Wiktionary</td>
+    <td>https://www.wiktionary.org/</td>
+    <td>Articles, Categories</td>
+    <td></td>
+</tr>
+<tr>
+    <td>Wikiquote</td>
+    <td>https://www.wikiquote.org/</td>
+    <td>Articles, Categories</td>
+    <td></td>
+</tr>
+<tr>
+    <td>Wikibooks</td>
+    <td>https://www.wikibooks.org/</td>
+    <td>Articles, Categories</td>
+    <td></td>
+</tr>
+<tr>
+    <td>Wikisource</td>
+    <td>https://www.wikisource.org/</td>
+    <td>Articles, Categories</td>
+    <td></td>
+</tr>
+<tr>
+    <td>Wikinews</td>
+    <td>https://www.wikinews.org/</td>
+    <td>Articles, Categories</td>
+    <td></td>
+</tr>
+<tr>
+    <td>Wikiversity</td>
+    <td>https://www.wikiversity.org/</td>
+    <td>Articles, Categories</td>
+    <td></td>
+</tr>
+<tr>
+    <td>Wikispecies</td>
+    <td>https://species.wikimedia.org/</td>
+    <td>Articles, Categories</td>
+    <td></td>
+</tr>
+<tr>
+    <td>Wikimedia Commons</td>
+    <td>https://commons.wikimedia.org/</td>
+    <td>Articles, Categories</td>
+    <td></td>
+</tr>
+
 <tr>
     <td colspan="4"><strong>Moebooru and MyImouto</strong></td>
 </tr>