Update format checking to clang-format version 16 #227
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Motivation
It has become hard to find and install clang-format version 9.
Description
This pull-request updates the "formatSourceCode.sh" shell script and the GitHub runner to use clang-format version 16. It also updates the source code to the slightly different formatting rules of version 16.
Action required
Developers must install clang-format version 16 on their system.
On macOS it is sufficient to install or upgrade to Xcode 16.1, which includes clang-format version 16.