Remove "CompletionManager". Completion models are now stored in Channel

Chatters list is now updated every 5 minutes

src/channel.hpp

@@ -3,6 +3,7 @@
 #include "messages/image.hpp"
 #include "messages/limitedqueue.hpp"
 #include "messages/message.hpp"
+#include "singletons/helper/completionmodel.hpp"
 #include "util/concurrentmap.hpp"
 
 #include <QMap>
@@ -64,6 +65,8 @@ public:
 
     static std::shared_ptr<Channel> getEmpty();
 
+    singletons::CompletionModel completionModel;
+
 protected:
     virtual void onConnected();