open twitch usercard on middle mouse (#1669)

Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

src/util/Twitch.cpp

@@ -0,0 +1,12 @@
+#include "util/Twitch.hpp"
+
+#include <QDesktopServices>
+
+namespace chatterino {
+
+void openTwitchUsercard(QString channel, QString username)
+{
+    QDesktopServices::openUrl("https://www.twitch.tv/popout/" + channel +
+                              "/viewercard/" + username);
+}
+}  // namespace chatterino

src/util/Twitch.hpp

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <QString>
+
+namespace chatterino {
+
+void openTwitchUsercard(const QString channel, const QString username);
+
+}  // namespace chatterino