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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.

recover from invalid asserts, so it will crash anyway, but not in
a controlled environment.

the evaluator of bit-or expressions.

Task:     - 234321
RevBy:    - Bjoern

The code completion was keeping around references to old documents after
the completion finished. This caused documents to stay in memory when
unloading projects, up until the next time you used the completion.

The scope of the classes is now separated and displayed in the second
column, and not included in the search.

Task: 237390
Details: Add 'allowDirectories' property to the widgets involved.

Details: StartFailed is triggered before the event loop starts on Windows.