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/localbitcoins/localbitcoins.go

@@ -118,6 +118,7 @@ func (l *LocalBitcoins) SetDefaults() {
 	l.RequestCurrencyPairFormat.Uppercase = true
 	l.ConfigCurrencyPairFormat.Delimiter = ""
 	l.ConfigCurrencyPairFormat.Uppercase = true
+	l.SupportsAutoPairUpdating = false
 }
 
 // Setup sets exchange configuration parameters
@@ -138,6 +139,10 @@ func (l *LocalBitcoins) Setup(exch config.ExchangeConfig) {
 		if err != nil {
 			log.Fatal(err)
 		}
+		err = l.SetAutoPairDefaults()
+		if err != nil {
+			log.Fatal(err)
+		}
 	}
 }