Add support for slnx solution files

[russgreen]

Description

Deserialize .slnx files

Usage Example

No response

Alternative

No response

Could you help with a pull-request?

Yes

[matkoch]

https://x.com/csharpfritz/status/1779788209313997180?s=46&t=NUrofe3RSXN9uAagAPcV5g

[BrycensRanch]

Hi, can this issue be reopened? Microsoft changed their tone and it's implemented in the dotnet sdk, msbuild, and once Nuget's client is updated, it will support slnx.

build: switch to slnx

dotnet/msbuild#10266

For editor support, recent versions of Rider already have it. For VSCode it is a work in progress.

dotnet/vscode-csharp#7048

I have personally tested it on VSCode with the VSCode Solution Explorer extension and it works fine but granted it is readonly. https://github.com/fernandoescolar/vscode-solution-explorer/releases/tag/v0.8.7

[BrycensRanch]

Please disregard that commit message, I was upset by something else unrelated. I am willing to PR this feature as well.