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It didn't make sure its Function* stayed valid. Now it does, by keeping
a copy of the list of CppDocuments (the snapshot) around.

Fixes: Make git diff work for staged files, do not launch submit if file list empty, make file  model read only, add conveniences

Details: Add a type data field to the git file model

Details:  - And do some simplification/consistency.

It still read "/qworkbench", the research project name for Qt Creator.

Reviewed-by: con

This should simplify the merging of the improved lookup context.

Introduced pp-scanner.cpp, renamed `pp' to `Preprocessor' and removed useless #includes.

The method `preprocess' returns the preprocessed text for the given expression.

This change removes a number of wrong usages of the CppModelManager::documents()/document().

Details:  - It will still change if the dependencies change, there's no
way to avoid that though.