PackageExtensions to SandboxGameExtensions Transform.ConcatTransforms => Transform.Concat Move GameServices to Sandbox.Internal NullChecks => SandboxGameExtensions Move internal EntityUtility to OOBChecks Move Sandbox.MenuEngine.FileSystem.OpenFileDialog to Sandbox.MenuUtility.OpenFileDialog Rename Sandbox.FileSystem in System.Tools to Editor.FileSystem Move Sandbox.IMenuAddon to Sandbox.Internal and make it an interface