Show provinces with best prices in trade window.

[ineveraskedforthis]

Trade overview should tell the player which province has the highest or lowest price for an item so player doesn’t have to click around to see where the best prices are.
After implementation of #133 it should account for obfuscation with some noise in missing digits.

[Calandiel]

Perhaps market views should have clickable trade good icons, akin to technology icons in the tile inspector? If clicked, they could show prices in the world, with red being expensive, green being cheap and yellows being balanced. Should be p simple to add and has a place in the UI already @ineveraskedforthis

[ineveraskedforthis]

Sounds good. I think it could also be accompanied with prices being displayed above provinces instead of their labels.

[Calandiel]

If we do prices we should also do production. Remember those economy visualizers for vic2? Having them built in would be amazing, I feel.