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

CONTRIBUTORS

@@ -12,9 +12,9 @@ ermalguni | https://github.com/ermalguni
 MadCozBadd | https://github.com/MadCozBadd
 ydm | https://github.com/ydm
 vadimzhukck | https://github.com/vadimzhukck
+lrascao | https://github.com/lrascao
 140am | https://github.com/140am
 marcofranssen | https://github.com/marcofranssen
-lrascao | https://github.com/lrascao
 dackroyd | https://github.com/dackroyd
 cranktakular | https://github.com/cranktakular
 woshidama323 | https://github.com/woshidama323
@@ -29,7 +29,7 @@ MarkDzulko | https://github.com/MarkDzulko
 gam-phon | https://github.com/gam-phon
 cornelk | https://github.com/cornelk
 if1live | https://github.com/if1live
-lozdog245 | https://github.com/lozdog245
+khcchiu | https://github.com/khcchiu
 herenow | https://github.com/herenow
 mshogin | https://github.com/mshogin
 soxipy | https://github.com/soxipy
@@ -52,3 +52,4 @@ Daanikus | https://github.com/Daanikus
 CodeLingoBot | https://github.com/CodeLingoBot
 blombard | https://github.com/blombard
 soxipy | https://github.com/soxipy
+lozdog245 | https://github.com/lozdog245