C++: Use SEH exception edges in IR and generate SEH exception edges for calls in __try, __except, and __finally blocks

[jketema]

Commit-by-commit review is recommended.

Pull Request checklist

All query authors

• A change note is added if necessary. See the documentation in this repository.
• All new queries have appropriate .qhelp. See the documentation in this repository.
• QL tests are added if necessary. See Testing custom queries in the GitHub documentation.
• New and changed queries have correct query metadata. See the documentation in this repository.

Internal query authors only

• Autofixes generated based on these changes are valid, only needed if this PR makes significant changes to .ql, .qll, or .qhelp files. See the documentation (internal access required).
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• Adding a new query? Consider also adding the query to autofix.