MTS SDK - NetStandard 2.1

Versions:

2.3.0.0 (1/6/2020) recommended
Port of MTS SDK to .NET Standard 2.1
Replaced Metrics.NET with App.Metrics
Replaced Code.Contracts with Dawn.Guard conditions
Replaced Common.Logging with Microsoft.Extensions.Logging
Upgraded RabbitMQ.Client to v5.1.2
Upgraded Newtonsoft.Json to v12.0.3
Upgraded Unity to 5.11.3
Removed obsolete methods and properties