[enh] general torrent search with piratebay

searx/engines/piratebay.py

@@ -9,6 +9,7 @@ url = 'https://thepiratebay.se/'
 search_url = url + 'search/{search_term}/0/99/{search_type}'
 search_types = {'videos': '200'
                ,'music' : '100'
+               ,'files' : '0'
                }
 
 def request(query, params):