[bisq-network/bisq] UI: In OfferBook, show tooltip on data point hover (#4228)

[cd2357]

Adding screenshots of the offerbook:

Before (when hovering over graph datapoints, nothing happens) :

![Screenshot from 2020-05-06 22-08-19](https://user-images.githubusercontent.com/15956136/81223868-0a39d100-8fe7-11ea-895a-f2f034dba725.png)

After (when hovering over datapoints, a tooltip is shown with the data point coordinates) :

![Screenshot from 2020-05-06 22-11-44](https://user-images.githubusercontent.com/15956136/81223915-23db1880-8fe7-11ea-85ca-ac7311e50918.png)


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