* update to latest package references
* update runtime framework
* update sdk
* automatically read NuGet package dependency info from csproj, where version info is fully qualified
* update file.wxs
To support PowerShell modules built with .NET Windows Compatibility Pack, we decided that it was best to ship the WCP assemblies with PS Core. This also adds many new .NET APIs be default while only adding ~3.5 MB additional disk footprint (to a ~137 MB install currently).
Also update the build to adopt the official .NET Core 2.1.
* Build Update
- Change `TargetFramework` to `netcoreapp2.1` and removed unnecessary `RuntimeFrameworkVersion` from `PowerShell.Common.props`
- Update dotnet SDK to 2.1.300-rc1-008662
- Update `TypeGen` target in `Build.psm1` to work with 2.1
- Rename macOS runtime to `osx-x64` as the old build logic expects 10.12 and breaks running on 10.13 system.
- Remove `PackageReference` to `System.Memory` as it's part of dotnetcore 2.1
- Update search for `crossgen` executable to find the matching version
* Test Update
- Update test tools `WebListener` to latest `asp.net core`
- Marked `AuthHeader Redirect` tests as `Pending` due to change in CoreFX
