feat: Add Live Emote Updates for BTTV (#4147)

This feature is enabled by default and can be disabled in settings with the "Enable BTTV live emotes updates" setting.

Co-authored-by: Felanbird <41973452+Felanbird@users.noreply.github.com>
Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

src/Application.hpp

@@ -149,6 +149,7 @@ public:
 private:
     void addSingleton(Singleton *singleton);
     void initPubSub();
+    void initBttvLiveUpdates();
     void initSeventvEventAPI();
     void initNm(Paths &paths);