Add UI library for Windows App SDK

[kingcean]

Windows App SDK is the latest development platform to run app on Windows. It targets .NET 5+ and uses WinUI 3. This PR is to add the supports on this.

Projects

Please ensure the development environment is ready before loading and building.

Project name	Type	Description
Windows Desktop\DiffPlex.Windows	Library	The UI library
Windows Desktop\DiffPlex.App	App	A demo app

Features

The diff text view element contains following familiar features.

• Split view and unified view.
• Read 2 specific files to diff.
• Collapse unchanged sections.
• Scroll and navigate the diff sections.

High performance: The demo shows 5K+ lines in less than 0.1s (test device is a Surface Pro 8).

The library also include a standalone window to load the diff text view to pop-up.

Build

The changeset includes 2 projects which declare to importe Windows App SDK packages. This means they can only build on...

• Windows 10/11 client operation system.
• x64, x86 and arm64 CPU architecture platforms, but not Any CPU anymore.

You can build and run DiffPlex.App project in Visual Studio. Please make sure the profile is Package.

It will output test data of texture diffs on Debug mode and empty on Release mode. This design is to make sure the release version is available to publish to Microsoft Store without further modification as well as we can test by using debug version.

[kingcean]

Build failure is expected because current CI/CD environment does not meet the requirement.

https://docs.microsoft.com/en-us/windows/apps/package-and-deploy/ci-for-winui3?pivots=winui3-packaged-csharp

[kingcean]

Hi @mmanela could you please have a look? Maybe need update CI/CD (Azure Pipeline) config to add supports of WinUI 3 packaged project to fix the check error.