Add a buy option not dependent on qpart

[Neogeekmo]

Create a buy step option not dependent on qpart, to avoid issue with auto buy setting link this step option to the quest id like :

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

Event: CHAT_MSG_LOOT (can check the auto questDrop on APR Route recorder)