Remove experimental IRC support (#5547)

mocks/include/mocks/EmptyApplication.hpp

@@ -133,7 +133,7 @@ public:
         return nullptr;
     }
 
-    IAbstractIrcServer *getTwitchAbstract() override
+    ITwitchIrcServer *getTwitchAbstract() override
     {
         assert(false && "EmptyApplication::getTwitchAbstract was called "
                         "without being initialized");

mocks/include/mocks/TwitchIrcServer.hpp

@@ -26,6 +26,38 @@ public:
     {
     }
 
+    void connect() override
+    {
+    }
+
+    void sendRawMessage(const QString &rawMessage) override
+    {
+    }
+
+    ChannelPtr getOrAddChannel(const QString &dirtyChannelName) override
+    {
+        assert(false && "unimplemented getOrAddChannel in mock irc server");
+        return {};
+    }
+
+    ChannelPtr getChannelOrEmpty(const QString &dirtyChannelName) override
+    {
+        assert(false && "unimplemented getChannelOrEmpty in mock irc server");
+        return {};
+    }
+
+    void addFakeMessage(const QString &data) override
+    {
+    }
+
+    void addGlobalSystemMessage(const QString &messageText) override
+    {
+    }
+
+    void forEachChannel(std::function<void(ChannelPtr)> func) override
+    {
+    }
+
     void forEachChannelAndSpecialChannels(
         std::function<void(ChannelPtr)> func) override
     {