Alpha 5 Update

Hi all - Here's a new update for Spirit of Glace.

• Rebuilt the meadow overworld so its art style fits better
• Added plant-based key system. Find seeds and plant them at Essy's treehouse. Then nurture the plants to grow keys.
• Added inventory UI that shows seeds and keys
  
• Added various doors including locked and unlocked version.
• Removed wall climbing for now.
• Removed gold coins. Gems only for now.
• Added a way to reset progress in options menu.
• Lots of behind the scenes architecture improvements