Added configuration file system.

Uses QSettings on citra-qt, and inih on citra-cli.

src/citra/config.h

@@ -0,0 +1,24 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <map>
+
+#include <inih/cpp/INIReader.h>
+
+#include "common/common_types.h"
+
+class Config {
+    INIReader* glfw_config;
+    std::string glfw_config_loc;
+
+    bool LoadINI(INIReader* config, const char* location, const std::string& default_contents="", bool retry=true);
+    void ReadControls();
+public:
+    Config();
+    ~Config();
+
+    void Reload();
+};