change code to only update the hitboxes of the sprites in the list of sprites within a certain range of the main character.

[FPErfvv]

This will improve the performance of the game, as the calculations for the hitbox take a lot of processing power. When the game was ran with a few thousand game elements while updating their hitbox, it was very laggy. With the same number of cows but without updating their hitboxes it ran much faster.