Refining mechanics 🔧

- Landing on a planet now cost 5 fuel

- It is now possible to leave the boundaries of the solar system at the cost of 80 fuel to travel to another solar system

- The ship is now able to be fueled and repaired even if it would exceed max capacity, with a confirmation message

- Exiting the inventory window while being on a planet doesn't make you leave the planet

- The amount of items you have in the inventory also appears in the Trade screen

- Added a few sound effects for immersion

- Small graphical fixes