AM - Mobs leveling system

[NEW] Dynamic Leveling System:

- All mobs now have levels that scale based on distance from spawn
- Higher-level mobs have increased health damage making 
each encounter more challenging

[NEW] Added Configuration file to control :

- Scale distance : 55000 blocks
- Base Level : 0
- Scale factor : 0.5
- Health modifier : 5
- Damage modifier : 5
- max level : 200