refactor: Move TwitchBadges to Application (#5096)

* refactor: Move TwitchBadges to Application

* refactor: Use named initializers

* refactor: Use `empty()` instead of `size() > 0`

* refactor: use emplace instead of push into the callback queue

src/controllers/highlights/BadgeHighlightModel.cpp

@@ -53,7 +53,7 @@ void BadgeHighlightModel::getRowFromItem(const HighlightBadge &item,
     setFilePathItem(row[Column::SoundPath], item.getSoundUrl());
     setColorItem(row[Column::Color], *item.getColor());
 
-    TwitchBadges::instance()->getBadgeIcon(
+    getIApp()->getTwitchBadges()->getBadgeIcon(
         item.badgeName(), [item, row](QString /*name*/, const QIconPtr pixmap) {
             row[Column::Badge]->setData(QVariant(*pixmap), Qt::DecorationRole);
         });