Support for PS6

[ebekker]

There's now some published guidance on hosting PS6, we should be able to adapt the PS5 handler to work with PS6 using this approach: https://github.com/PowerShell/PowerShell/tree/master/docs/host-powershell

[concentrateddon]

And as a note, this shell hosting ability is confirmed working on the latest .NET Core release.

[ebekker]

Thanks Don, this is with the move to .NET Core 2.0 which PS6 is now dependent on.

I just recently upgraded Tug to use the final 1.0 SDK project format (MSBuild) and updated nuget dependencies to the latest in the .NET Core 1.x series. Next step is to migrate Tug to .NET Core/Standard 2.0. I've been holding out a bit since the 2.0 release is so close now, at which point I'll only make this next migration only once.