feat: delete messages from context menu (#5956)

src/providers/twitch/TwitchChannel.hpp

@@ -59,6 +59,7 @@ struct HelixGlobalBadges;
 using HelixChannelBadges = HelixGlobalBadges;
 
 class TwitchIrcServer;
+class TwitchAccount;
 
 const int MAX_QUEUED_REDEMPTIONS = 16;
 
@@ -164,6 +165,12 @@ public:
     QString getCurrentStreamID() const override;
     void createClip();
 
+    /// Delete the message with the specified ID as a moderator.
+    ///
+    /// If the ID is empty, all messages will be deleted, effectively clearing
+    /// the chat.
+    void deleteMessagesAs(const QString &messageID, TwitchAccount *moderator);
+
     // Data
     const QString &subscriptionUrl();
     const QString &channelUrl();