Code Quality: Added root files to projects to make them easier to edit

[Lamparter]

Adds Directory.Packages.props, Directory.Build.props and .editorconfig to all projects as None to make them appear in Solution Explorer. This makes them easier to edit.

[hez2010]

I personally don't like this change as solution-wide files shouldn't appear as project-wide items, instead it should be placed under the solution hierarchy directly IMO. So I'm sorry but I hesitate to approve this change.
While I'm not strongly against it if other members think it's fine.

[Lamparter]

They apply to all the projects; that's my logic for them being included in all of them.

[marcofranzen99]

I would have also expected the files to be in a Solution Items folder. I think the files are also rarely needed and would rather distract from the individual projects when navigating in the Solution Explorer than in a separate Solution Items folder.

This is how i usually do it my private projects:

But this might also be just personal preference

[0x5bfa]

I don't approve either. It doesn't need to be everywhere and should not.

This is how i usually do it my private projects:

I think this is also what Hez has in his mind too.

[yaira2]

@Lamparter thank you for the PR. Currently the community would prefer not to adopt this change, but we appreciate the contribution as always and hope to find other areas where we can collaborate 🙂