We fixed nexTurn method and we implement attack and useSpell actions. 
We delete two classes : spell and passive. 
Indeed, they have the same function as the class effect.
We fixed nexTurn method and we implement attack and useSpell actions. 
We delete two classes : spell and passive. 
Indeed, they have the same function as the class effect.

We instantiate constants which will be used in the class Main, in
Battle.
The Main class isn't still created.

The changes have been deleted from the commit for an unknown reason.