…#114)

This cleans up the UI generally and adds AvaloniaEdit as a rich editor
with syntax highlighting and many other features. The warning note has
been moved to a new About dialog to clean up the header a bit.

This change surfaced some annoying whitespace behavior with Roslyn's
NormalizeWhitespace method, so this adds some leading/trailing newlines
in places after NormalizeWhitespace is called to help prettify the
output.

…est conversions (paulirwin#124)

* Add CLI option to read syntax mappings (yaml file)

* Apply mappings to imports, methods and annotations

* Document mappins in README

* Convert class bounded type parameters, close paulirwin#125

* Update comment test with class type bounded params

Updated GitHub Sponsors username in FUNDING.yml

* GUI: Add Paste button to Java Input pane, paulirwin#136

* GUI: Fix Paste button positioning in file controls row, paulirwin#136

* Update JavaToCSharpGui/Infrastructure/TextClipboard.cs

Co-authored-by: Copilot <[email protected]>

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Co-authored-by: Danial Ahmad <[email protected]>
Co-authored-by: Paul Irwin <[email protected]>
Co-authored-by: Copilot <[email protected]>

* Bump to .NET 10

* Bump dependencies

* Update Github workflows

* Copilot PR feedback and code style formatting

---------

Co-authored-by: Paul Irwin <[email protected]>

- Uses C# 14 features like extension blocks, and some older C# features
- Converts the sln to the new slnx format
- Turns on warnings as errors for all projects
- Uses GeneratedRegexAttribute where Regex was used
- Misc code cleanup