Update demo (0.82) "Refiner"

What's new in this update:

1. Improved Audio: We've polished the audio to make the game more immersive. The sound effects have been enhanced for a better overall experience.
2. New Feature - Refiner: Introducing the "Refiner" - a new feature that allows you to refine unwanted inventory items into batteries.
3. New Item - Crystals: We've added a new item called "Crystals," which can appear after destroying large white rocks. These crystals can be picked up and refined into batteries with increased charge or repair kits, depending on the crystal's color.