XamlVisualEditor v0.2.0

What's Changed

• Fix layout persistence, design surface interaction, and bridge diagnostics by @tobitege in #16
• [#17 PR 1] Update Avalonia and Dock, migrate to ReactiveUI 26 by @tobitege in #18
• [#17 PR 2] Form editing in the designer, shell and editor by @tobitege in #19
• [#17 PR 4] Text editing, property editor, Toolbox and Command Palette extensions by @tobitege in #20
• [#17 PR 5] Preview theme labels, Flowery.NET theme extension and TFVC extension by @tobitege in #21

Full Changelog: v0.1.0...v0.2.0