[bisq-network/bisq] Secondary sort order in Offer lists (#4167)

[Florian Reimair]

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### Description

There is no way to manually sort offers in [Market]->[Offer Book].

Being that way, it limits the use of this view because one cannot see at first glance what is up for offer in terms of volumes available.

#### Version

all

### Steps to reproduce

start up Bisq.

### Expected behaviour

have a secondary sort order sorting offers by volume if there are offers with the same price

### Actual behaviour

<!-- explain what happened instead of the expected behaviour -->
The sort order is kind of random. But not in a good way. I have seen sort orders where one trader is on top, another one is below. They both had same price and similar volumes. This favors the "top" trader.

### Screenshots

<!--Screenshots if gui related, drag and drop to add to the issue -->
![Screenshot from 2020-04-14 15-06-21](https://user-images.githubusercontent.com/1070734/79228466-c6c5ca00-7e61-11ea-95b1-fa890e9fccb6.png)

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https://github.com/bisq-network/bisq/issues/4167
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