Fetch currency prices from poe.ninja

[BoozeAddict]

Now that poe.ninja supports currency pricing, and it's taken from Ange's async exchange, it would be good to see the real prices, instead of trade site.

[Kvan7]

Yep that is the plan. Just currently will be waiting a little bit for poe.ninja to more fully sort out their data formats before implementing, so that it doesn't break when rasmuskl is updating and things.