Feature: Add support to check whether an exchange supports automatic currency pair updates and if they don't, show a warning if the last currency pair update is >= 30 days

Also fix race condition in config get/set functions

exchanges/anx/anx.go

@@ -50,6 +50,7 @@ func (a *ANX) SetDefaults() {
 	a.ConfigCurrencyPairFormat.Uppercase = true
 	a.ConfigCurrencyPairFormat.Index = "BTC"
 	a.AssetTypes = []string{ticker.Spot}
+	a.SupportsAutoPairUpdating = false
 }
 
 //Setup is run on startup to setup exchange with config values
@@ -74,6 +75,10 @@ func (a *ANX) Setup(exch config.ExchangeConfig) {
 		if err != nil {
 			log.Fatal(err)
 		}
+		err = a.SetAutoPairDefaults()
+		if err != nil {
+			log.Fatal(err)
+		}
 	}
 }