AOT / Publish trimmed support

[tznind]

Fixes

• Terminal.Gui doesn't support AOT #2414 - Changes required to make UICatalog/gui.cs work when AOT or PublishTrimmed is true on a csproj.
• AOT support with .Net 8? #3109

This is a super set of #2422

Pull Request checklist:

• I've named my PR in the form of "Fixes #issue. Terse description."
• My code follows the style guidelines of Terminal.Gui - if you use Visual Studio, hit CTRL-K-D to automatically reformat your files before committing.
• My code follows the Terminal.Gui library design guidelines
• I ran dotnet test before commit
• I have made corresponding changes to the API documentation (using /// style comments)
• My changes generate no new warnings
• I have checked my code and corrected any poor grammar or misspellings
• I conducted basic QA to assure all features are working

[tig]

Closing due to staleness + @BDisp has gotten most of this to work.