Refactor NetworkRequest class

Add followUser and unfollowUser methods to TwitchAccount

src/common/NetworkResult.hpp

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <rapidjson/document.h>
+#include <QJsonObject>
+
+namespace chatterino {
+
+class NetworkResult
+{
+    QByteArray data_;
+
+public:
+    NetworkResult(const QByteArray &data);
+
+    QJsonObject parseJson() const;
+    rapidjson::Document parseRapidJson() const;
+    QByteArray getData() const;
+};
+
+}  // namespace chatterino