main: Add an option to modify the currrent game's configuration

Creates a new entry in the Emulation menu called "Configure Current Game..." that is only available if a game is currently being executed in yuzu. When selected, it opens the game properties dialog for the current game.

Thanks to @BSoDGamingYT for reminding me to do this.

src/yuzu/main.h

@@ -216,6 +216,7 @@ private slots:
     void OnMenuInstallToNAND();
     void OnMenuRecentFile();
     void OnConfigure();
+    void OnConfigurePerGame();
     void OnLoadAmiibo();
     void OnOpenYuzuFolder();
     void OnAbout();
@@ -249,6 +250,7 @@ private:
     void ShowMouseCursor();
     void OpenURL(const QUrl& url);
     void LoadTranslation();
+    void OpenPerGameConfiguration(u64 title_id, const std::string& file_name);
 
     Ui::MainWindow ui;