Update to slnx (#705)

Update to slnx (#705)

* Update to slnx

This upgrades all the solution files to the new Solution Format .slnx

* Use .slnx in the builds

* Update README.md and CodeQL

* Address PR feedback

Removed FileIO as BuildDependency for KscViewer
Added sync-submodule dependency to fetch-argparse.vcxproj

* Delete old .sln files

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Co-authored-by: twostars <i.am.twostars@gmail.com>

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