Fluent UI

[david-risney]

Apply Windows Fluent design to the UI.

I've tried using https://wpfui.lepo.co/ which looked very promising but has issues in ListView with DataGrid not showing columns or column headers.

Here's how far I got before unable to workaround the issue with ListView headers.

[david-risney]

This PR has been merged lepoco/wpfui#979. Once there's a release with it we can look back into converting the UI over to this

[david-risney]

The work needed to switch to WPFUI maybe better to switch to WinUI3 / WinAppSDK. It will be easier to get the thing msix packaged at the same time (#94). We no longer need to stay on WPF like previously to support Win7+ where WebView2 could run since WebView2 (and all of chromium) dropped support for Win7/8