Updated .gitignore and added .editorconfig with Fantomas settings

[xperiandri]

• Use Fantomas and .editorconfig (my setup, I have not tried to align with the repo style)
• Use targets to automatically restore tools and automatically format the whole repo

[Copilot]

Pull Request Overview

This PR enhances project configuration by standardizing tool usage and formatting setups.

• Introduces a Directory.Build.targets file with targets for updating, restoring, and formatting dotnet tools (including Fantomas).
• Updates CHANGELOG.md with entries for the new .gitignore and .editorconfig files.
• Adds supporting configuration files (.gitattributes, .git-blame-ignore-revs, .fantomasignore, .editorconfig, and .config/dotnet-tools.json) to enforce consistent formatting and tool behavior.

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Directory.Build.targets	Adds targets to update, restore, and run dotnet tools including Fantomas.
CHANGELOG.md	Updates changelog entries reflecting modifications to gitignore and editorconfig.
.gitattributes	Adds settings for VB and shell files.
.git-blame-ignore-revs	Establishes commits to ignore (e.g., formatting changes).
.fantomasignore	Adds ignore settings for AssemblyInfo files to be skipped by Fantomas.
.editorconfig	Provides a comprehensive set of formatting rules including Fantomas settings.
.config/dotnet-tools.json	Updates tool configurations with explicit tool versions and rollForward settings.

[Copilot]

Consider using the already defined property $(_BuildProjBaseIntermediateOutputPath) instead of $(BaseIntermediateOutputPath) for consistency with other tool-related properties.

Suggested change

	<_DotnetFantomasOutputFile>$(BaseIntermediateOutputPath)dotnet-fantomas-msbuild-$(NETCoreSdkVersion)-$(OS)</_DotnetFantomasOutputFile>
	<_DotnetFantomasOutputFile>$(_BuildProjBaseIntermediateOutputPath)dotnet-fantomas-msbuild-$(NETCoreSdkVersion)-$(OS)</_DotnetFantomasOutputFile>

[xperiandri]

@knocte I have not tried to align the Fantomas setup to the repo style. If you have any preferences, please comment.
The formatting commit will be included in the blame ignore file to not pollute the history.
I have a PowerShell script that formats only files that are changed between the master and the current branch. I you prefer going this way instead of forcing the whole repo formatting.

[knocte]

If you prefer going this way instead of forcing the whole repo formatting.

I actually prefer whole repo formatting, however, I was holding off doing fantomas myself because I knew that doing it right now would make a bunch of PRs have conflicts; and not just straightforward conflicts, but conflicts very annoying to resolve. Therefore I would be inclined to work on this only after we have merged a bunch of PRs that are pending (yes the DRAFT ones also count, we plan to revisit those soon).