Yllah v0.2

Changelog :

• Removed unused NPC hiding spot
• Movement speed normalized
• Added Audio Mixing (WIP)
• Fixed a bug where the mouse was invisible and inactive when going back to menu from game (with Esc key) 
• Added jump visual feedback
• Updated run animation
• Added some props to plain areas
• Moved one NPCs
• New idle animation for NPC when found