Engine: SyncTimeout can't be set (#438)

* Bittrex GetDepositHistory method return new DepositHistory struct type

* Id field of DepositHistory type changed to int64

* check exchange (exist and enabled) before calling methods on, to avoid program crashes

* Update bittrex_types.go

* t2

* Program always uses the DefaultSyncerTimeout because c.SyncTimeout in engine/syncer.go newer set in code

* gofmt file

Co-authored-by: Ryan O'Hara-Reid <oharareid.ryan@gmail.com>

engine/engine.go

@@ -418,6 +418,7 @@ func (e *Engine) Start() error {
 			SyncContinuously: e.Settings.SyncContinuously,
 			NumWorkers:       e.Settings.SyncWorkers,
 			Verbose:          e.Settings.Verbose,
+			SyncTimeout:      e.Settings.SyncTimeout,
 		}
 
 		e.ExchangeCurrencyPairManager, err = NewCurrencyPairSyncer(exchangeSyncCfg)