Changes

- Added system for loading mobs from configs, implemented "walking" and "idle" states, mobs added for the test: Zombie, Spider, Skeleton, Pig
- New Zombie skin with new animation
- Particle system optimization
- Added different destruction times for blocks, from the original game
- Added player animation "blocks breaking"
- Added player health and satiety
- Added UI animation when satiety or health is low
- Added fall damage, hunger damage and damage particles
- Health regeneration from satiety
- Character death, death screen, respawn with recovery
- The main cause of crashes was found, the logic of switching game/player states was rewritten
- Player spawn immediately on the surface
- Fixes in YML parser