Update NuGet package versions in project files

Upgraded several NuGet dependencies across multiple csproj files, including Microsoft.Web.WebView2, Google.Protobuf, MsgReader, bblanchon.PDFiumV8.Win32, and Lib.Harmony. This ensures compatibility with the latest features and bug fixes from upstream packages.

Update changelog for 4.2.1 release

Fix some errors from cli options

Error is from this commit a95b050