[everia.club] Add support

- Unescape title and URL
- Add tags and categories metadata
    Lookup tag id with API instead of downloading tag page
- Add category extractor
- Add tests
- Rename EveriaExtractor to EveriaPostExtractor
- Fix EveriaPostExtractor example
- Lookup tags/categories by post id
- Add date extractor
- Remove leftover pages parameter
- Add error handling for invalid dates.
- Add filename numbering
    Parse date
- Rename extract() to images()
- Remove html import
- Fix search/date URLs with page number
- Fix tag/category search
- Fix post extractor
- Fix tag, category extractors
- Fix search extractor
- Only load first page once
- Fix date extractor
- Fix tests
- Clean up search extractor

test/results/everia.py

@@ -0,0 +1,37 @@
+# -*- 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 everia
+
+
+__tests__ = (
+{
+    "#url"      : "https://everia.club/2024/09/23/mikacho-조미카-joapictures-someday/",
+    "#category" : ("", "everia", "post"),
+    "#class"    : everia.EveriaPostExtractor,
+    "#archive"  : False,
+    "#count"    : 32,
+
+    "title"     : "Mikacho 조미카, JOApictures ‘Someday’",
+    "post_category": "Korea",
+    "tags"      : ["[JOApictures]", "Mikacho 조미카"]
+},
+{
+    "#url"      : "https://everia.club/tag/yeon-woo-연우/",
+    "#category" : ("", "everia", "tag"),
+    "#class"    : everia.EveriaTagExtractor,
+},
+{
+    "#url"      : "https://everia.club/category/japan/",
+    "#category" : ("", "everia", "category"),
+    "#class"    : everia.EveriaCategoryExtractor,
+},
+{
+    "#url"      : "https://everia.club/?s=saika",
+    "#category" : ("", "everia", "search"),
+    "#class"    : everia.EveriaSearchExtractor,
+}
+)