Changed to a stage sharing method using a data store!

■2023/04/29: Sharing update
 ➤Changed the sharing method from the traditional method to one using a data store,
　 so that sharing can now be completed in-game.
 ➤Added 8 types of decorative blocks.
 ➤The latest (1.0.2) paid version also comes with a
   free 4-month ticket for a Fantia paid plan!