Sorted the NuGet packages listed in Directory.Packages.props alphabetically and removed a couple of duplicate entries (PowerShellStandard.Library and System.ServiceModel.Security). Also removed the TargetFramework from this file since this varies from project to project.
Added a simple NuGet.config file to enforce consistency in package sources and identify trusted signers.
Moved the ManagePackageVersionsCentrally MSBuild property from Directory.Build.props to Directory.Packages.props.
Updated most of the NuGet packages to the latest version available (ignoring pre-release).
PowerShellStandard.LibraryandSystem.ServiceModel.Security). Also removed theTargetFrameworkfrom this file since this varies from project to project.ManagePackageVersionsCentrallyMSBuild property from Directory.Build.props to Directory.Packages.props.