Added comment about the "Score" parameter in PlayerData.java.

See file for more details.
Fixed two ifs with the instanceof command to verify the nature of an item inside the inventory. Also commented.
Creation de la methode "optimizeSmell".

Elle cree un ArrayList contenant toutes les odeurs actives dans l'ordre de leur intensite et elimine des odeurs actives, celles ayant une intensite de 0.
Added the "getStrongestSmell" which returns the first smell in the sorted array of smells