[WIP] Upgrade to Avalonia 11.0 + add Browser project

[maxkatz6]

Opening this PR as I thought it should be pretty easy to migrate, but also opens some nice possibilities. I will push changes to this branch once in a while, updating it with newer Avalonia builds.

What I want to do in this PR

• [x] Upgrade to Avalonia 11.0
• [x] Browser support
• [x] Replace legacy file pickers with sandbox-friendly API (also required updating shared code to use Stream instead of file paths where possible)
• [ ] "Recently opened" links should use bookmarks API instead of saving file paths (for browser support and possibly sandboxed macos or mobile)
• [ ] Replace TreeView with virtualized TreeDataGrid and see how better it is for this application
• [ ] Update Welcome Screen UI to hide features not available on the browser (opening the Project)
• [ ] NET 7 AOT should work with zero changes and configuration, but yet to be tested with this application.
• [ ] Do some codebase research and see if any missing features can be ported from WPF version (like, something that needs TextBlock.Inlines support)
• [ ] Dark mode

Out of scope, but could be done

• Upgrade to Fluent theme (separated PR?)
• Mobile support is possible now, but I don't think this apps needs to have a mobile version (am I wrong?), also needs interface rewritting to be more adaptive

[maxkatz6]

Sneak peek of browser support. Anybody can checkout and run browser project. Keep in mind you need .NET 7.0 and "warm-tools" and "wasm-experimental" workloads installed.

[KirillOsenkov]

I didn't have time to maintain the Avalonia part, so thanks a lot of giving it a refresh! Much appreciated. Don't worry about the changes to the Avalonia version, and let me know if you need to change something in Core or the logger projects.

The Windows (WPF) half has more features that I didn't have time to add to Avalonia and was hoping someone would come along and keep the Avalonia version in sync. Sorry about that. Nothing easier than "walk both versions line by line and see what is missing from Avalonia" comes to mind.

Mention me here if you need my help or have questions.

[KirillOsenkov]

Oh, and whenever you're happy with the browser version, we can start publishing it at https://avalonia.msbuildlog.com or something (let me know if you can think of a better URL). https://live.msbuildlog.com is already taken by the Blazor version that lives in the live branch. It also desperately needs some UX improvements.

[kant2002]

@maxkatz6 maybe you can wrap this up? I think this is good progress for MsBuildogViewer on Avalonia.

[maxkatz6]

@kant2002 I am primarily waiting for preview5 to be released + some spare time. There are some breaking changes comparing to preview4, so I want to handle it as early.

[maxkatz6]

@KirillOsenkov I have done minimal changes what I had planned. Remaining improvements can be done independently later. The only problem left is to get CI working. I will come back on the weekends, but if you have idea, how to fix it - please let me know.

[slang25]

The wasm app is so damn cool! I'd really like to see this make its way to a hosted public site, like a fancier version of https://live.msbuildlog.com/ Are you planning on picking this up again @maxkatz6 now that Avalonia 11 is out of preview?