Add price info to swap info screen

[EdBallou]

When viewing historical swap data, it shows the number of tokens but not the price of those tokens at the time the swap occurred. This is helpful information when reviewing transactions. While you can look up the date and time and get a nearly accurate price, I'd rather it show the price, even if it's just oracle price, but the actual price done for the swap would be awesome.

If you were also to add total price of swap, that would be interesting but not required.

If you want to do something quick and dirty in the UI for now and wait and see till later, I'm okay with that.