Adds viewer list + livechecks (#105)

* Added check for livestatus + tooltip.

* Also added live check on startup.

* Added viewerlist + livesearch.

* Refactored code to make it compacter.

src/widgets/chatwidget.hpp

@@ -115,6 +115,9 @@ public slots:
 
     // Open twitch channel stream through streamlink
     void doOpenStreamlink();
+
+    // Open viewer list of the channel
+    void doOpenViewerList();
 };
 
 }  // namespace widgets