This updates all projects to target .NET Framework 4.7.1. The TencentCOS and Tardigrade backends depend on .NET Standard 2.0. When a .NET Framework prior to 4.7.1 is targeted, the system cannot be sure that all the dependencies exist, so it copies all dependent assemblies to the output directory. This causes many assemblies from the System namespace to become bundled in the release. https://stackoverflow.com/a/48875007 We had previously attempted to make individual projects target 4.7.1 (see pull request #4242), but this can cause compatibility issues when 4.6.2 projects depend on 4.7.1. projects. This will require Mono 5.10.0 or greater (previously, we required 5.0.0 or greater). https://www.mono-project.com/docs/about-mono/releases/5.10.0/#class-libraries This fixes issue #4234.
This project is not really 3rd party. It was created solely for use with Duplicati, but it depends on the Mono.Posix.dll file, which is not found on the common Windows developer platform. By creating this mini project, it is possible to reference the functions from Mono.Posix during a Windows build without having access to the Mono.Posix.dll. As this dll is never invoked on Windows, it should have no interest to the Windows developer.