Adds the GPU views for WinUI, but there are a few othe things it need
to do:
- Builds ANGLE as this is the primary interop between SkiaSharp and
DirectX
- Builds an interop library that extends types needed for interacting
with ANGLE
- Enables AngleSwapChainPanel as this is the WinUI view that sets up
the GL context
- Enables the SKSwapChainPanel as this is the SkiaSharp accelerated
view
- Add a new NativeAssets package for WinUI native files
* Merge and modernize the binding projects
* Remove UWP and watchOS
* Add the native assets projects
* Rename bootstrapper.ps1 to build.ps1
* Add new device tests
* Rework the test skipping feature
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Co-authored-by: Jerome Laban <jerome.laban@nventive.com>
