BTCMarkets: Add subscription configuration (#1624)

* Subscription: Add List.GroupByPairs

* BTCMarkets: Add subscription conf

* BTCMarkets: Upgrade test config

testdata/configtest.json

@@ -249,7 +249,6 @@
    "websocketResponseCheckTimeout": 30000000,
    "websocketResponseMaxLimit": 7000000000,
    "websocketTrafficTimeout": 30000000000,
-   "websocketOrderbookBufferLimit": 5,
    "baseCurrencies": "AUD",
    "currencyPairs": {
     "requestFormat": {
@@ -261,11 +260,9 @@
      "delimiter": "-"
     },
     "useGlobalFormat": true,
-    "assetTypes": [
-     "spot"
-    ],
     "pairs": {
      "spot": {
+      "assetEnabled": true,
       "enabled": "BTC-AUD",
       "available": "BTC-AUD,LTC-AUD,LTC-BTC,ETH-BTC,ETH-AUD,ETC-AUD,ETC-BTC,XRP-AUD,XRP-BTC,POWR-AUD,POWR-BTC,OMG-AUD,OMG-BTC,BCHABC-AUD,BCHABC-BTC,BCHSV-AUD,BCHSV-BTC,GNT-AUD,GNT-BTC,BAT-AUD,BAT-BTC,XLM-AUD,XLM-BTC"
      }
@@ -317,7 +314,13 @@
      "iban": "",
      "supportedCurrencies": ""
     }
-   ]
+   ],
+   "orderbook": {
+    "verificationBypass": false,
+    "websocketBufferLimit": 5,
+    "websocketBufferEnabled": false,
+    "publishPeriod": 10000000000
+   }
   },
   {
    "name": "BTSE",