Currency package update (#247)

* Initial currency overhaul before service system implementation

* Remove redundant currency string in orderbook.Base
Unexport lastupdated field in orderbook.Base as it was being instantiated multiple times
Add error handling for process orderbook

*  Remove redundant currency string in ticker.Price
 Unexport lastupdated field in ticker.Price
 Add error handling for process ticker function and fix tests

* Phase Two Update

* Update translations to use map type - thankyou to kempeng for spotting this

* Change pair method name from Display -> Format for better readability

* Fixes misspelling and tests

* Implement requested changes from GloriousCode

* Remove reduntant function and streamlined return in currency_translation.go

* Revert pair method naming conventions

* Change currency naming conventions

* Changed code type to exported Item type with underlying string to reduce complexity

* Added interim orderbook process method to orderbook.Base type

* Changed feebuilder struct field to currency.Pair

* Adds fall over system for backup fx providers

* deprecate function and children and fix linter issue with btcmarkets

* Fixed requested changes

* Fix bug and move mtx for rates

* Fixed after rebase oopsies

* Fix linter issues

* Fixes race conditions in testing functions

* Final phase coinmarketcap update

* fix linter issues

* Implement requested changes

* Adds configuration variables to increase/decrease time durations between updating currency file and fetching new currency rates

* Add a collection of tests to improve codecov

* After rebase oopsy fixes for btse

* Fix requested changes

* fix after rebase oopsies and add more efficient comparison checks within currency pair

* Fix linter issues

testdata/configtest.json

@@ -10,8 +10,8 @@
   "rotate": true
  },
  "profiler": {
-    "enabled": false
-   },
+  "enabled": false
+ },
  "currencyConfig": {
   "forexProviders": [
    {
@@ -72,7 +72,9 @@
    "uppercase": true,
    "delimiter": "-"
   },
-  "fiatDisplayCurrency": "USD"
+  "fiatDisplayCurrency": "USD",
+  "currencyFileUpdateDuration": 0,
+  "foreignExchangeUpdateDuration": 0
  },
  "communications": {
   "slack": {
@@ -1307,5 +1309,6 @@
    "supportedCurrencies": "USD",
    "supportedExchanges": "ANX,Kraken"
   }
- ]
+ ],
+ "fiatDispayCurrency": ""
 }