[imhentai] inherit from BaseExtractor

combine all imhentai-like sites into one module

docs/supportedsites.md

@@ -337,12 +337,6 @@ Consider all listed sites to potentially be NSFW.
     <td>Chapters, Manga</td>
     <td></td>
 </tr>
-<tr>
-    <td>HentaiEra</td>
-    <td>https://hentaiera.com/</td>
-    <td>Galleries, Search Results, Tag Searches</td>
-    <td></td>
-</tr>
 <tr>
     <td>HentaiFox</td>
     <td>https://hentaifox.com/</td>
@@ -367,12 +361,6 @@ Consider all listed sites to potentially be NSFW.
     <td>Galleries, Search Results</td>
     <td></td>
 </tr>
-<tr>
-    <td>HentaiRox</td>
-    <td>https://hentairox.com/</td>
-    <td>Galleries, Search Results, Tag Searches</td>
-    <td></td>
-</tr>
 <tr>
     <td>HiperDEX</td>
     <td>https://hiperdex.com/</td>
@@ -463,12 +451,6 @@ Consider all listed sites to potentially be NSFW.
     <td>Albums, Favorites, Favorites Folders, Galleries, individual Images, Personal Posts, Search Results, Subreddits, Tag Searches, User Profiles</td>
     <td></td>
 </tr>
-<tr>
-    <td>IMHentai</td>
-    <td>https://imhentai.xxx/</td>
-    <td>Galleries, Search Results, Tag Searches</td>
-    <td></td>
-</tr>
 <tr>
     <td>Imxto</td>
     <td>https://imx.to/</td>
@@ -1326,6 +1308,28 @@ Consider all listed sites to potentially be NSFW.
     <td></td>
 </tr>
 
+<tr>
+    <td colspan="4"><strong>IMHentai and Mirror Sites</strong></td>
+</tr>
+<tr>
+    <td>IMHentai</td>
+    <td>https://imhentai.xxx/</td>
+    <td>Galleries, Search Results, Tag Searches</td>
+    <td></td>
+</tr>
+<tr>
+    <td>HentaiEra</td>
+    <td>https://hentaiera.com/</td>
+    <td>Galleries, Search Results, Tag Searches</td>
+    <td></td>
+</tr>
+<tr>
+    <td>HentaiRox</td>
+    <td>https://hentairox.com/</td>
+    <td>Galleries, Search Results, Tag Searches</td>
+    <td></td>
+</tr>
+
 <tr>
     <td colspan="4"><strong>jschan Imageboards</strong></td>
 </tr>