Better Highlights (#1320)

* Support for user-defined sounds and colors

* Make color & sound columns selectable

* Add custom row for subscription highlights

* Add subscriptions to custom highlights and centrally manage highlight colors

* Dynamically update message highlight colors

src/providers/twitch/TwitchMessageBuilder.hpp

@@ -95,6 +95,8 @@ private:
     bool highlightVisual_ = false;
     bool highlightAlert_ = false;
     bool highlightSound_ = false;
+
+    QUrl highlightSoundUrl_;
 };
 
 }  // namespace chatterino