"BugFix n' BugMake"
•Enhanced Buying System in progress. Works for (life) consummable, TODO
for equipment :
	→Hero now buys a fair quantity of consummables to heal himself in
batle.
•Hero doesn't stay in the shop forever if he can't buy what he want (no
enough money, or no enough products in shop). Instead, he will wander
for a few fights and return to the shop afterwards.
•Resurrection system done. Hero can die moar.
•Splited Hero.java : All the inventory/equipment/gold related things are
now in Inventory.java