Revisit sorting of trades by name within a config when randomization is off

[jpenilla]

As of 1.8.2 trades within a config are sorted by name when randomization is off. This was done to make things consistent with the trade list GUI. However, when editing the config files directly this is not always desired. With this in mind, I think this change should be reverted, and the GUI should be adjusted to show the raw order from the config as well. I don't remember whether Bukkit config API preserves the order of maps correctly, if not a switch to Configurate may be needed. A nice extra might be a mechanism to sort/reorder trades from within the GUI.