Reviewed-by: Erik Verbruggen

Still need to change it to use RefactoringChanges, and to do better definition
generation.

For answers to questions about where to insert a snippet/chunk of C++ code. Ok,
currently it will only find the One And Only place to insert method
declarations in classes, and it will need some tuning.

Now the method can be used to get the fully qualified name of
destructors, operator-ids and conversion-function-ids.

Revert "Revert "Try to fix the type rewriter.""

This reverts commit c9bc1e7c.