Returns the full path to the directory where the game should store files such as player information, saved game data and user preferences.
Files in the external storage directory are not guaranteed to persist in case the game is uninstalled from the system.
Windows/iOS: the same as GetExternalStorageDirectory
Mac OS X: ~/Documents/<bundle-name>/
Android: returns the path to the directory which won't be erased if the application is removed. E.g.: /sdcard/.ethanon/<application_package>/files