exchanges/engine: Add multichain deposit/withdrawal support (#794)

* Add exchange multichain support

* Start tidying up

* Add multichain transfer support for Bitfinex and fix poloniex bug

* Add Coinbene multichain support

* Start adjusting the deposit address manager

* Fix deposit tests and further enhancements

* Cleanup

* Add bypass flag, expand tests plus error coverage for Huobi

Adjust helpers

* Address nitterinos

* BFX wd changes

* Address nitterinos

* Minor fixes rebasing on master

* Fix BFX acceptableMethods test

* Add some TO-DOs for 2 tests WRT races

* Fix acceptableMethods test round 2

* Address nitterinos

cmd/documentation/documentation.go

@@ -283,6 +283,11 @@ func main() {
 				URL:           "https://github.com/soxipy",
 				Contributions: 2,
 			},
+			{
+				Login:         "lozdog245",
+				URL:           "https://github.com/lozdog245",
+				Contributions: 2,
+			},
 		}...)
 
 		if verbose {

cmd/documentation/root_templates/root_readme.tmpl

@@ -79,6 +79,8 @@ However, we welcome pull requests for any exchange which does not match this cri
 + Recent and historic trade processing. See [trades](/exchanges/trade/README.md).
 + Backtesting application. An event-driven backtesting tool to test and iterate trading strategies using historical or custom data. See [backtester](/backtester/README.md).
 + WebGUI (discontinued).
++ Exchange HTTP mock testing. See [mock](/exchanges/mock/README.md).
++ Exchange multichain deposits and withdrawals for specific exchanges. See [multichain transfer support](/docs/MULTICHAIN_TRANSFER_SUPPORT.md).
 
 ## Planned Features