refactor: Modernize samples

[Kryptos-FR]

PR Details

Modernize the samples.

I did not enable the nullable feature since it isn't the case yet in the whole codebase. I also excluded the C# tutorials projects (beside using file scope namespaces) because we might to use a different style for them that is more beginner friendly.

Types of changes

• [x] Docs change / refactoring / dependency upgrade
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [ ] My change requires a change to the documentation.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.
• [ ] I have built and run the editor to try this change out.

[Kryptos-FR]

We have a problem: the integrated code editor in the GameStudio is old and doesn't understand modern C#. It's thinking all modern lines of code are incorrect.

For example :

Therefore, we can't modernize the samples before we update (or get rid of) the code editor.

[IXLLEGACYIXL]

the code editor uses roslyn of net6 the latest roslynpad would understand it

but updating it isnt as easy..