Optimization and Bug fixes

Optimization:

• Optimized Update calls for better performances.
• Optimized physics calculations for better performances by changing many complicated colliders with simpler ones.
• Optimized bushes and trees meshes for better performances.

General Fixes:

• Fixed ambient quality settings which would not change.
• Fixed loading screen when reloading a game after dying.
• Added back mushrooms, red mushrooms, tomatoes and beans as findable vegetables.
• Fixed audio settings not getting changed at the start of the game.