Add multiple buy on the same step

[Neogeekmo]

tranform the BuyMerchant to accept list ou Buyitem

now:

BuyMerchant = {
            count = 5,
            itemID = 74660,
        },

wanted

BuyMerchant = {
        {
            count = 5,
            itemID = 74660,
        },
        {
            count = 1,
            itemID = 84560,
        },
}