Change gold bar loot items to stamped gold bars.

[Silvercloud29]

As a old school miner and someone who tries to help new miners out. Little things like this are really helpful when it comes to mining. Since there are little things that aren't really obvious when you start off mining for the first time. Like the fact that processed ore is worthless and you need raw ore to sell it to traders. Or for it to be worthwhile for QM to sell it.