C++: Support #elifdef, #elifndef, and MSVC's #import

[jketema]

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).
• Changes are validated at scale (internal access required).
• Adding a new query? Consider also adding the query to autofix.

[Copilot]

Copilot reviewed 6 out of 16 changed files in this pull request and generated 1 comment.

Files not reviewed (10)

• cpp/downgrades/59cb96ca699929b63941e81905f9b8de7eed59a6/preprocdirects.ql: Language not supported
• cpp/downgrades/59cb96ca699929b63941e81905f9b8de7eed59a6/upgrade.properties: Language not supported
• cpp/ql/lib/semmle/code/cpp/Include.qll: Language not supported
• cpp/ql/lib/semmle/code/cpp/Preprocessor.qll: Language not supported
• cpp/ql/lib/semmlecode.cpp.dbscheme: Language not supported
• cpp/ql/lib/upgrades/1aa71a4a687fc93f807d4dfeeef70feceeced242/upgrade.properties: Language not supported
• cpp/ql/test/library-tests/preprocessor/preprocessor/pp23.cpp: Language not supported
• cpp/ql/test/library-tests/preprocessor/preprocessor/ppms.cpp: Language not supported
• cpp/ql/test/library-tests/preprocessor/preprocessor/preproc.expected: Language not supported
• cpp/ql/test/library-tests/preprocessor/preprocessor/test.tlh: Language not supported

Comments suppressed due to low confidence (1)

cpp/ql/lib/change-notes/2024-01-20-elifdef.md:5

• The phrase 'which represents the #import preprocessor directive as used by the Microsoft Visual C++ for importing type libraries' could be clearer. It should be 'which represents the #import preprocessor directive used by Microsoft Visual C++ for importing type libraries.'

* A new class `TypeLibraryImport` was introduced, which represents the `#import` preprocessor directive as used by the Microsoft Visual C++ for importing type libraries.

Tip: Copilot only keeps its highest confidence comments to reduce noise and keep you focused. Learn more

[esteffin]

LGTM

[geoffw0]

The force push didn't change anything as far as I can tell (a merge would have been easier to review).

[jketema]

The force push didn't change anything as far as I can tell (a merge would have been easier to review).

Sorry, just dealing with a submodule bump in what is for me the least headache inducing way.