Merge pull request AvaloniaUI#230 from AvaloniaUI/feature/vs2022-tweaks

VS2022 Extension Tweaks

Bump version to 0.9.10.1.

Merge pull request AvaloniaUI#147 from AvaloniaUI/update-templates

Update templates to 0.9.10 and netcore 3.1.

Fix setting _tagSpan.

Was removed by mistake in AvaloniaUI#113, causing errors to not be removed.