yuzu_tester: Use config, icon, and main from yuzu-cmd

src/yuzu_tester/config.h

@@ -0,0 +1,24 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <string>
+
+class INIReader;
+
+class Config {
+    std::unique_ptr<INIReader> sdl2_config;
+    std::string sdl2_config_loc;
+
+    bool LoadINI(const std::string& default_contents = "", bool retry = true);
+    void ReadValues();
+
+public:
+    Config();
+    ~Config();
+
+    void Reload();
+};