Migrate to slnx

[martincostello]

Now that Visual Studio 2022 17.4 has been released, all major IDEs should now support .slnx files.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.55%. Comparing base (eea4876) to head (f1568f2).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3411   +/-   ##
=======================================
  Coverage   93.55%   93.55%           
=======================================
  Files         110      110           
  Lines        3834     3834           
  Branches      719      719           
=======================================
  Hits         3587     3587           
  Misses        247      247           

Flag	Coverage Δ
Linux	93.55% <ø> (ø)
Windows	93.55% <ø> (ø)
macOS	93.55% <ø> (ø)

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