Minor Dev Environment Fixes (.editorconfig cleanup, typo fix, .gitignore tweak)

[petercrabtree]

Minor fixes that seemed like they're small enough to bundle together for review (there should be no run-time change in behavior):

• Removed duplicate settings in .editorconfig.
• Fix invalid .editorconfig value (valid values for csharp_space_around_declaration_statements seem to be "false" and "ignore"; "do_not_ignore" currently is equivalent to false based on csharp_space_around_declaration_statements setting has ambiguous options dotnet/roslyn#28022).
• Change .gitignore to ignore all .vscode folders, not just a top-level one.
• Typo fix (ReportExludedTypes -> ReportExcludedTypes)

[Copilot]

Pull Request Overview

This PR contains minor development environment and code quality fixes with no runtime behavior changes. The changes focus on cleaning up configuration files and fixing a spelling error in property names.

• Removed duplicate .editorconfig settings and corrected an invalid configuration value
• Updated .gitignore to ignore all .vscode folders instead of just the top-level one
• Fixed spelling error in property name from "ReportExludedTypes" to "ReportExcludedTypes"

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

File	Description
.editorconfig	Removed duplicate settings and fixed invalid csharp_space_around_declaration_statements value
ICSharpCode.ILSpyCmd/IlspyCmdProgram.cs	Fixed spelling in property name and usage from "ReportExludedTypes" to "ReportExcludedTypes"
ICSharpCode.ILSpyX/MermaidDiagrammer/GenerateHtmlDiagrammer.cs	Fixed spelling in property name from "ReportExludedTypes" to "ReportExcludedTypes"
ICSharpCode.ILSpyX/MermaidDiagrammer/Generator.Run.cs	Fixed spelling in property usage from "ReportExludedTypes" to "ReportExcludedTypes"

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[siegfriedpammer]

Thank you very much for your contribution!