Improve geo bypass mechanism

* Introduce geo bypass context
* Add ability to bypass based on IP blocks in CIDR notation
* Introduce --geo-bypass-ip-block

youtube_dl/extractor/tvplay.py

@@ -227,14 +227,16 @@ class TVPlayIE(InfoExtractor):
 
     def _real_extract(self, url):
         url, smuggled_data = unsmuggle_url(url, {})
-        self._initialize_geo_bypass(smuggled_data.get('geo_countries'))
+        self._initialize_geo_bypass({
+            'countries': smuggled_data.get('geo_countries'),
+        })
 
         video_id = self._match_id(url)
         geo_country = self._search_regex(
             r'https?://[^/]+\.([a-z]{2})', url,
             'geo country', default=None)
         if geo_country:
-            self._initialize_geo_bypass([geo_country.upper()])
+            self._initialize_geo_bypass({'countries': [geo_country.upper()]})
         video = self._download_json(
             'http://playapi.mtgx.tv/v3/videos/%s' % video_id, video_id, 'Downloading video JSON')