Rebex .NET components 2019 R2: .NET 4.8 and VS 2019 support

This is an enhancement and bugfix release:

Support for Visual Studio 2019

All Rebex components are now fully supported in Microsoft Visual Studio 2019.

Support for .NET Framework 4.8

.NET Framework 4.8 is a fully supported platform.

Fixed hung-channels in SFTP server

We fixed a race condition in Rebex File Server's SSH packet handling code that could lead to hung channels.

Elliptic curves on Linux with .NET Core 2.1/2.2

On Linux, binaries for .NET Standard 2.0 now utilize OpenSSL elliptic curve routines via .NET Core 2.1/.2, making it possible to use ECDH and ECDSA ciphers in TLS and SSH with no need of external plugins.

And more...

See the release history for a complete list of changes.