New menu song (not complete)

• Improved Pen UI to be cleaner and have more space.
  
• Fixed bug where creatures that always bring back more than 1 item would sometimes bring back less than their minimum.
• Modified Douglas’s dialogue.
• Added information on what items a creature is more likely to get.
• Increased transparency of the side arrows.
• Changed menu music to new original theme (Still needs work).

Balance Changes

• Swallower: Speed, -40% > -20%