alpha: `TreeViewItem` element updated with new attributes

Updated the `TreeViewItem` element in several ways. The `Content` attribute, previously bound to `DisplayName`, has been removed, meaning the element no longer displays the `DisplayName` as its content. An `IsExpanded` attribute has been added with a default value of `True`, causing the element to always be expanded. Additionally, an `ItemsSource` attribute has been added and bound to `Children`, allowing the element to display child items if any are present.

1st Release: Fool's Day

What's Changed

• Add initial codebase by @tajbender in #1
• Create initial gui by @tajbender in #2
• add initial dotnet-desktop Workflow by @tajbender in #3
• Develop Web Browser and Workbench Page prototypes by @tajbender in #4
• Update README.md by @tajbender in #7
• Navigation by @tajbender in #8

New Contributors

• @tajbender made their first contribution in #1

Full Changelog: https://github.com/electrifier/electrifier.v1.24/commits/debug