Make bridge withdrawals based on mapping data

[motrebski]

General

Blocktrades bridge has functionality in wich users can do withdrawals. Memo information is now based on data which are getting from new mapping API call.

Code Preparation

Please review all your changes one last time before committing

• Check for unused code
• No unrelated changes are included
• None of the changed files are reformatting only
• Code is self explanatory or documented
• All written text is properly translated (english language)

Testing

The branch has been tested on the following browsers (desktop and mobile view)

• Chrome
• Opera
• Firefox
• Safari

There were not changes in UI.

[sschiessl-bcp]

Is the current implementation still working?

What is the purpose of the new mapping data?

[dnotestein]

For the bitshares bridge, we use to use a memo system like "btc:my_receive_address". Now the memo is a UUID. I forget all the reasons for the change, but it's something we want.

[sschiessl-bcp]

Merged, only affects Blocktrades.

If you want or can, I would be interested in hearing the reasons behind the change @dnotestein

[sschiessl-bcp]

The release candidate is out, could you please test your integration? #3251