* Websocket: Use ErrSubscribedAlready
instead of errChannelAlreadySubscribed
* Subscriptions: Replace Pair with Pairs
Given that some subscriptions have multiple pairs, support that as the
standard.
* Docs: Update subscriptions in add new exch
* RPC: Update Subscription Pairs
* Linter: Disable testifylint.Len
We deliberately use Equal over Len to avoid spamming the contents of large Slices
* Websocket: Add suffix to state consts
* Binance: Subscription Pairs support
* Bitfinex: Subscription Pairs support
* Bithumb: Subscription Pairs support
* Bitmex: Subscription Pairs support
* Bitstamp: Subscription Pairs support
* BTCMarkets: Subscription Pairs support
* BTSE: Subscription Pairs support
* Coinbase: Subscription Pairs support
* Coinut: Subscription Pairs support
* GateIO: Subscription Pairs support
* Gemini: Subscription Pairs support and improvement
* Hitbtc: Subscription Pairs support
* Huboi: Subscription Pairs support
* Kucoin: Subscription Pairs support
* Okcoin: Subscription Pairs support
* Poloniex: Subscription Pairs support
* Kraken: Add subscription Pairs support
Note: This is a naieve implementation because we want to rebase the
kraken websocket rewrite on top of this
* Bybit: Subscription Pairs support
* Okx: Subscription Pairs support
* Bitmex: Subsription configuration
* Fixes unauthenticated websocket left as CanUseAuth
* Fixes auth subs happening privately
* CoinbasePro: Subscription Configuration
* Consolidate ProductIDs when all subscriptions are for the same list
* Websocket: Log actual sent message when Verbose
* Subscriptions: Improve clarity of which key is which in Match
* Subscriptions: Lint fix for HugeParam
* Subscriptions: Add AddPairs and move keys from test
* Subscriptions: Simplify subscription keys and add key types
* Subscriptions: Add List.GroupPairs Rename sub.AddPairs
* Subscription: Fix ExactKey not matching 0 pairs
* Subscriptions: Remove unused IdentityKey and HasPairKey
* Subscriptions: Fix GetKey test
* Subscriptions: Test coverage improvements
* Websocket: Change State on Add/Remove
* Subscriptions: Improve error context
* Subscriptions: Fix Enable: false subs not ignored
* Bitfinex: Fix WsAuth test failing on DataHandler
DataHandler is eaten by dataMonitor now, so we need to use ToRoutine
* Deribit: Subscription Pairs support
* Websocket: Accept nil lists for checkSubscriptions
If the user passes in a nil (implicitly empty) list, we would not panic.
Therefore the burden of correctness about that data lies with them.
The list of subscriptions is empty, and that's okay, and possibly
convenient
* Websocket: Add context to NilPointer errors
* Subscriptions: Add context to nil errors
* Exchange: Fix error expectations in UnsubToWSChans
* Bump CI versions
* Specifically set go version as 1.17.x bumps it to 1.18
* Another
* Adjust AppVeyor
* Part 1 of linter issues
* Part 2
* Fix various linters and improvements
* Part 3
* Finishing touches
* Tests and EqualFold
* Fix nitterinos plus bonus requester jobs bump for exchanges with large number of tests
* Fix nitterinos and bump golangci-lint timeout for AppVeyor
* Address nits, ensure all books are returned on err due to syncer regression
* Fix the wiggins
* Fix duplication
* Fix nitterinos
