- Migrated to twitch helix api for stream notifications

- Added 2 new fields to creds.yml -> TwitchClientId and TwitchClientSecret
- Users now have to provide them in order to use twitch stream notifications as Twitch is shutting down old api on 18th of February 2022
- Possibly fixed some issues with streams randomly getting cleared
- Added an incomplete trovo stream notification provider

src/NadekoBot/Common/IBotCredentials.cs

@@ -22,6 +22,8 @@ public interface IBotCredentials
     string CoinmarketcapApiKey { get; }
     string TrovoClientId { get; }
     string CoordinatorUrl { get; set; }
+    string TwitchClientId { get; set; }
+    string TwitchClientSecret { get; set; }
 }
 
 public class RestartConfig