[picazor] add 'user' extractor (#7083 #7504 #7795 #8717)

* [picazor] Add support for Picazor
* [picazor] Improve tests for picazor
* [picazor] run flake8
* [picazor] working on tests
* update extractor
* update tests
* update supportedsites

---------

Co-authored-by: Mike Fährmann <mike_faehrmann@web.de>

test/results/picazor.py

@@ -0,0 +1,39 @@
+# -*- coding: utf-8 -*-
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+
+from gallery_dl.extractor import picazor
+
+
+__tests__ = (
+{
+    "#url"     : "https://picazor.com/en/kailey-mae",
+    "#class"   : picazor.PicazorUserExtractor,
+    "#range"   : "1-50",
+    "#pattern" : r"https://picazor\.com/uploads/.+\.jpg",
+    "#count"   : 50,
+
+    "count"    : 278,
+    "num"      : range(200, 278),
+    "extension": "jpg",
+    "filename" : str,
+    "id"       : "re:[0-9a-f]+",
+    "mime"     : "photo",
+    "path"     : str,
+    "user"     : "kailey-mae",
+    "visible"  : True,
+    "subject"  : {
+        "id" : "66077ba2b64e3f3d178f39ac",
+        "uri": "kailey-mae",
+    },
+},
+
+{
+    "#url"     : "https://picazor.com/vi/badassnugget",
+    "#comment" : "non-'en' language code",
+    "#class"   : picazor.PicazorUserExtractor,
+},
+
+)