[bisq-network/bisq] Add bsq price trend indicator (#3226)

[chimp1984]

The median price is not based on amount weight, so the average is considered more exact IMO.
This PR replaces the median 90 day price wioth the average 30 days and adds an indicator if price is going up or down.

<img width="1191" alt="Screen Shot 2019-09-08 at 12 02 18" src="https://user-images.githubusercontent.com/54558767/64486852-e002fa00-d232-11e9-9a60-76ea71826878.png">
<img width="1199" alt="Screen Shot 2019-09-08 at 12 03 48" src="https://user-images.githubusercontent.com/54558767/64486854-e002fa00-d232-11e9-8618-863f9273b3df.png">


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