Improve AOT support, update references

[Sergio0694]

This PR includes the following changes:

• Updates WASDK to latest preview
• Updates the Windows SDK projections to latest stable
• Enable all AOT generators for CsWinRT
• Fix all AOT generator warnings
• Consolidates the NuGet.Build.Tasks.Pack dependency (fixes UWP builds too)

[jstedfast]

@azchohfi this broke the build

[Sergio0694]

@jstedfast do you have repro steps locally? I can still build the .sln 🤔