[bisq-network/proposals] Allow trader negotiation of disputed BTC payout (#234)

[James Cox]

> _This is a Bisq Network proposal. Please familiarize yourself with the [submission and review process](https://docs.bisq.network/proposals.html)._

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When something goes wrong in a trade, users must resort to mediation which involves a third-party suggesting how the BTC collateral should be distributed.  The mediator has the tools to build a transaction which the users then sign to accept and make the payout happen.  If one user disagrees they are forced to wait for arbitration.

**Bisq should enable traders to negotiate the disputed payout between themselves.**  Since they are the sole owners of the 2-2 multisig they could do this anyway, but there exist no tools to let then collaborate in such a way.

Adding a simple form to trader chat would make it easy to interact.  One user could propose a suggested payout split to the other, which could then be approved or counter-proposed.  This process could repeat until an agreement is made.  The form could include some commonly-used payout suggestions the same way that the mediation GUI does, along with fields for custom payout amounts.  Once both parties agree to a propsal they sign and the seller broadcasts the payout Tx.

This should be considered an advanced feature and should have appropriate warnings about the ability to get scammed?  ("*if you are unsure about anything, choose Mediation*").

Mediation will continue to be an option for either party at any time.  Likewise with Arbitration, if they want to wait the 10 or 20 day timelock period.


Ideas leading to this proposal came from the discussions [here](https://github.com/bisq-network/proposals/issues/220), and [here](https://github.com/bisq-network/proposals/issues/233), and [here](https://github.com/bisq-network/bisq/issues/4340).

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### Example:


![image](https://user-images.githubusercontent.com/47253594/86548773-38faf780-bf03-11ea-84a0-daeb112b89bf.png)


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