Miscellaneous bug fixes (#513)

* Various bug fixes

* Deadlink, cleanup plus bug fixes

* Various Kraken fixes

* Add convert func for decimal unix timestamps

* Convert all test times to UTC

* Kraken: Make assets a pointer to prevent excessive copying

* Docker slash fix

* Address nits plus bump ITBit last checked pairs timestamp

* Set pairs to enabled pairs when getting active orders

* Use asset translator for UpdateAccountInfo and more checks for the exchange template tool

* Address MadCozBadd's nits

* Make exchange var 2 chars

* Make program more user friendly

* Project wide comment checks and exchName check

* Fix Huobi indexing bug and use correct pair formatting

* Address nits + readme change

testdata/preengine_config.json

@@ -1007,7 +1007,7 @@
       "baseCurrencies": "USD,SGD",
       "assetTypes": "SPOT",
       "supportsAutoPairUpdates": false,
-      "pairsLastUpdated": 1566798411,
+      "pairsLastUpdated": 1591062026,
       "configCurrencyPairFormat": {
        "uppercase": true
       },