restructured manifest and plugins loading; updated plugins

plugins/youtube_download/yt_dlp/extractor/dailymail.py

@@ -19,11 +19,22 @@ class DailyMailIE(InfoExtractor):
             'ext': 'mp4',
             'title': 'The Mountain appears in sparkling water ad for \'Heavy Bubbles\'',
             'description': 'md5:a93d74b6da172dd5dc4d973e0b766a84',
+            'thumbnail': r're:https?://i\.dailymail\.co\.uk/.+\.jpg',
         },
     }, {
         'url': 'http://www.dailymail.co.uk/embed/video/1295863.html',
         'only_matching': True,
     }]
+    _WEBPAGE_TESTS = [{
+        'url': 'https://www.daily-news.gr/lifestyle/%ce%b7-%cf%84%cf%81%ce%b1%ce%b3%ce%bf%cf%85%ce%b4%ce%af%cf%83%cf%84%cf%81%ce%b9%ce%b1-jessie-j-%ce%bc%ce%bf%ce%b9%cf%81%ce%ac%cf%83%cf%84%ce%b7%ce%ba%ce%b5-%cf%83%cf%85%ce%b3%ce%ba%ce%bb%ce%bf%ce%bd/',
+        'info_dict': {
+            'id': '3463585',
+            'ext': 'mp4',
+            'title': 'Jessie J reveals she has undergone surgery as she shares clips',
+            'description': 'md5:9fa9a25feca5b656b0b4a39c922fad1e',
+            'thumbnail': r're:https?://i\.dailymail\.co\.uk/.+\.jpg',
+        },
+    }]
 
     def _real_extract(self, url):
         video_id = self._match_id(url)