Version 5.0.0

• Updated CryptoExchange.Net to version 8.0.3, see https://github.com/JKorf/CryptoExchange.Net/releases/tag/8.0.3
• Updated the library to use System.Text.Json for (de)serialization instead of Json.Net
• Updated Spot websocket implementation from V1 to V2
  • Moved requesting of WebSocket token for private endpoints from user endpoint to internal
  • Removed automatic mapping of BTC to XBT (V2 API used BTC as symbol instead of the previous XBT)
  • Respone models have been updated to V2
  • Spread subscription has been removed, part of Ticker stream now
  • Added individual order book subscription
  • Added instrument subscription
  • Added user balances subscription
  • UserTrade subscription has been removed, part of Order stream now
  • Added socketClient.SpotApi.PlaceMultipleOrdersAsync endpoint
  • Added socketClient.SpotApi.EditOrderAsync endpoint
  • Added socketClient.SpotApi.ReplaceOrderAsync endpoint
• Added Shared implementation for Futures WebSocket and REST APIs
• Extended Shared implementation for Spot WebSocket API
• Added restClient.SpotApi.Trading.CancelAllOrdersAfterAsync endpoint
• Added restClient.FuturesApi.ExchangeData.GetTickerAsync endpoint
• Added restClient.FuturesApi.Trading.GetOrdrAync endpoint
• Renamed clientOrderId to userReference parameters in Spot orders as it was implemented with the userref field
• Added new clientOrderId parameter to Spot orders using the correct cl_ord_id field
• Updated Shared Spot REST implementation to use new clientOrderId property
• Updated restClient.FuturesApi.GetBalancesAsync response so it's more discoverable
• Updated AssetStatus Enum values
• Updated SymbolStatus Enum values
• Fixed deserialization issue FuturesApi.Trading.GetOpenPositionsAsync