Implement proper savegame #6
Description
Currently, the saving of the game happens only if the player exits to the main menu. And even then, only the player info is correctly saved. Everything else doesn't save correctly: for example, the shop contents. Ideally, the saving would happen after a set amount of time or before a big event (a boss for example). This would also need a quick save icon to be implemented.
Other implementations like https://github.com/TeamSirenix/odin-serializer could also be considered to make this work properly, no need to keep using the current asset.