Replace clang-format.sh with a faster, better version
We need to replace clang-format.sh with a version that meets our use-cases.
- we need to be able to check whether anything is misformatted without actually reformatting it.
- we need to be able to look at only those files that are staged to be committed, so that our git hooks can work.
- we need a mode to reformat everything that has changed in git, so that we can run a quick "reformat everything" command without scanning the entire repostiory (which takes around 60 seconds for me).
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