* Use version overrides for ImageSharp 2
* Move Directory.Packages.props to root, use GlobalPackageReference and replace Microsoft.CSharp with Microsoft.CodeAnalysis.CSharp
* Replace NPoco.SqlServer with NPoco and remove unused System dependencies
* Fix package validation and MSBuild warnings
* Add nuget.config and enable package source mapping
* Remove explicitly set C# language version
* Add empty Directory.Packages.props file for acceptance test
* Downgrade SixLabors.ImageSharp back to 3.0.2 because of breaking changes
* Update ImageSharp/ImageSharp.Web to 3.1.0 and use ComputeHMAC
* Fix Umbraco.Web.UI.Login not showing up in solution
* Update PackageValidationBaselineVersion to 13.0.0-rc1 and remove all CompatibilitySuppressions.xml files
* Remove unnecessary package references
* Move Microsoft.EntityFrameworkCore.Design reference and add comment
* Disable package validation and fix override in tests
* Inherit package validation setting for EF Core projects
* Updated the package validation baseline version to 12 RC1
* Update PackageValidationBaselineVersion to 12.0.0 and remove CompatibilitySuppressions.xml files
* Clean up project files
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Co-authored-by: Ronald Barendse <ronald@barend.se>