Version 8.0.0

• Added new cross exchange interfaces implementation
  • Supports REST, WebSocket, Spot and Futures API's
  • Added various client interfaces for specific functionality
  • Added SharedSymbol type, taking care of symbol formatting for different exchanges
  • Added dynamic pagination support for shared functionality
  • Added various shared Enum definitions
  • Added ExchangeWebResult and ExchangeEvent, exchange specific versions of WebCallResult and DataEvent
  • See https://jkorf.github.io/CryptoExchange.Net/index.html#idocs_shared for more info
• Added tradingMode and deliverDate parameters to BaseApiClient FormatSymbol method
• Added ExecutePages method to ExchangeHelpers static class
• Added ApplySymbolRules method to ExchangeHelpers static class
• Added ResubscribingFailed event for websocket connections
• Added handling of http result 429 (ratelimited) during websocket connection
• Added Websocket dispose before creating new connection when reconnecting
• Updated Sourcelink package version
• Marked ISpotClient and IFuturesClient references as deprecated