Engine: Protocol Features, coverage, types, BTC markets websocket (#368)

* Attempts to update orderbook so it doesn't need to sort

* Reverts the ws ob stuff. Gets rid of sorting because it happens later. Adds some exchange features

* update existing feature lists. Expands list definition to match my emotions

* Adds bithumb bitmex and bitstamp. adds a couple more types

* Features for you, features for me, features for bittrex, btcmarkets, btse, coinbasepro, coinut, exmo, gateio and gemini

* Features for hitbtc, huobi, itbit, kraken, lakebtc, lbank, localbitcoins, okcoin, okex, poloniex, yobit, zb

* Who can forget good old alphapoint?

* Adds btcmarksets websocket :glitch_crab: fixes alphapoint features

* Adds extra data not in the documentation :/

* Replaces websocket features by using protocol features. However, it breaks it due to import cycles. I'm not sure what I'll do just yet

* Removes import cycle via duplicate structs.

* Increases coverage of config with `TestCheckCurrencyConfigValues`. Moves all currency pair package types into their own files or places it at the bottom of files if necessary

* Increase coverage in code.go

* One way of determining a test has failed, is when to it fails. Removed redundant explanation

* Increases code coverage of conversion

* Lint fixes

* Fixes orderbook tests

* Re-adds sorting because its important to still have the internal pre-processed orderbook to be representative of a real orderbook

* Secret lints that did not show up via Windows linting

* Adds protocol package to contain exchange features

* Fixes protocol implementation

* Fixes ws tests

* Addresses the following: Removes st-st-stutters in config types, changes GetAvailableForexProviders -> GetSupportedForexProviders, removes errors from tests where error is nil, removes orderbook setup when not necessary, removes import newlines, removes false bools from declaration, changes should of to should have

* imports and casing

* Fixes two more nil error checks

exchanges/protocol/features.go

@@ -0,0 +1,40 @@
+package protocol
+
+// Features holds all variables for the exchanges supported features
+// for a protocol (e.g REST or Websocket)
+type Features struct {
+	TickerBatching         bool `json:"tickerBatching,omitempty"`
+	AutoPairUpdates        bool `json:"autoPairUpdates,omitempty"`
+	AccountBalance         bool `json:"accountBalance,omitempty"`
+	CryptoDeposit          bool `json:"cryptoDeposit,omitempty"`
+	CryptoWithdrawal       bool `json:"cryptoWithdrawal,omitempty"`
+	FiatWithdraw           bool `json:"fiatWithdraw,omitempty"`
+	GetOrder               bool `json:"getOrder,omitempty"`
+	GetOrders              bool `json:"getOrders,omitempty"`
+	CancelOrders           bool `json:"cancelOrders,omitempty"`
+	CancelOrder            bool `json:"cancelOrder,omitempty"`
+	SubmitOrder            bool `json:"submitOrder,omitempty"`
+	SubmitOrders           bool `json:"submitOrders,omitempty"`
+	ModifyOrder            bool `json:"modifyOrder,omitempty"`
+	DepositHistory         bool `json:"depositHistory,omitempty"`
+	WithdrawalHistory      bool `json:"withdrawalHistory,omitempty"`
+	TradeHistory           bool `json:"tradeHistory,omitempty"`
+	UserTradeHistory       bool `json:"userTradeHistory,omitempty"`
+	TradeFee               bool `json:"tradeFee,omitempty"`
+	FiatDepositFee         bool `json:"fiatDepositFee,omitempty"`
+	FiatWithdrawalFee      bool `json:"fiatWithdrawalFee,omitempty"`
+	CryptoDepositFee       bool `json:"cryptoDepositFee,omitempty"`
+	CryptoWithdrawalFee    bool `json:"cryptoWithdrawalFee,omitempty"`
+	TickerFetching         bool `json:"tickerFetching,omitempty"`
+	KlineFetching          bool `json:"klineFetching,omitempty"`
+	TradeFetching          bool `json:"tradeFetching,omitempty"`
+	OrderbookFetching      bool `json:"orderbookFetching,omitempty"`
+	AccountInfo            bool `json:"accountInfo,omitempty"`
+	FiatDeposit            bool `json:"fiatDeposit,omitempty"`
+	DeadMansSwitch         bool `json:"deadMansSwitch,omitempty"`
+	Subscribe              bool `json:"subscribe,omitempty"`
+	Unsubscribe            bool `json:"unsubscribe,omitempty"`
+	AuthenticatedEndpoints bool `json:"authenticatedEndpoints,omitempty"`
+	MessageCorrelation     bool `json:"messageCorrelation,omitempty"`
+	MessageSequenceNumbers bool `json:"messageSequenceNumbers,omitempty"`
+}