Prefer 'using' to 'typedef' in examples

Victor Poughon requested to merge examples-using into develop


  • Replace typedef with using in all C++ examples
  • clang-format all examples again


'using' is generally prefered in modern C++. It's important here because examples are part of the documentation (cookbook). It could be done for the rest of the code, but it's much less important.

Part of #1865


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  • Optionally, run git diff develop... -U0 --no-color | -p1 -i on latest changes and commit

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