Add support for the new slnx solution format

[raisr]

Description

Starting with VS 2026 there is a new solution file format. But nuke :setup does not detect this solution. So i can't use nuke for the new project.

Usage Example

No response

Alternative

No response

Could you help with a pull-request?

No

[furesoft]

you can select None and add the project by your own with dotnet sln mysolution.slnx add build/build.csproj

[raisr]

you can select None and add the project by your own with dotnet sln mysolution.slnx add build/build.csproj

Thx. It works. 👍

[IT-VBFK]

@raisr https://github.com/Fallout-build/Fallout