Add .slnx solution file

[agriffard]

Use new simpler xml format for solution file.

Comparison:
Current .sln: 150ko
Added .slnx: 28ko

[agriffard]

I had to delete the .sln because there was a build error if there is more than 1 solution file.

[hishamco]

I already did this, but didn't push it, but it's good to use the new cleaner solution file

[hishamco]

Why?

[agriffard]

It was in the existing sln.
Here are the explanations I get asking about HasPerformanceSessions:

In a .NET / Visual Studio solution file (.sln), the HasPerformanceSessions = true entry appears when Visual Studio has stored Performance Profiler session data for that solution.

It usually looks like this inside the .sln file:

GlobalSection(Performance) = preSolution
HasPerformanceSessions = true
EndGlobalSection

Why it appears?
Visual Studio automatically adds this when you run the Performance Profiler (via Debug → Performance Profiler or Analyze → Performance Profiler).
It persists even after closing the profiler unless you remove the session from the Performance Explorer.

How to remove it?
From Visual Studio UI

Open Performance Explorer:
Analyze → Windows → Performance Explorer
If you see any profiling sessions listed, right-click → Remove.
Save the solution — the HasPerformanceSessions entry should disappear.

Manual removal

Close Visual Studio.
Open the .sln file in a text editor.
Delete the GlobalSection(Performance) block containing HasPerformanceSessions.
Save and reopen the solution.
Prevent it from reappearing

✅ Tip: This setting is harmless — it doesn’t affect build or runtime behavior. It’s only metadata for Visual Studio’s profiling tools.

[hishamco]

@agriffard could you answer my previous question? Then we can merge

[hishamco]

Let's merge this ..