rebalance (part1)
Rebalance zone miboss
Rebalance materias pwr & mpCost
Rebalance items, materias, enemies
Remove characters auto-fighting
Rebalance materia pwr, mpCost, price + rebalance items
New way to find zone boss
Improve code with objects names
Add game difficulty => only on enemies
Don't equip materia on buying + don't equip item if no more places
Merge branch 'feature/rebalance' into develop