Default namespace for item templates

[Mrxx99]

This infers the root namespace of the project (by default the name of the project) an item template is added to and uses this for the item template when no one is specified with the --namespace flag. It also does not give an error if the item template is created outside of a project.

This sadly only works for C#.

Maybe in future this could be improved to include also the folder structure, e.g "AvaloniaApplication.Views" but that would require changes in the template SDK.

[Takoooooo]

LGTM,thanks for doing that!
But may you share the documentation you were using to implement that just to make sure we will have resources to maintain that later

[Mrxx99]

@Takoooooo Here is the documentation:

https://github.com/dotnet/templating/wiki/Binding-and-project-context-evaluation

Here there is also binding to a namespace for VS mentioned but I did not use that because a) VS does not support item templates yet and b) it does not work for CLI, so I would have to add another fallback block besides another parameter which would bloat the template.json (more than half of the file would be about namespaces :D). I hope in future the bind:namespace can be used from CLI as well respecting also the folder path in the project