[tor-bugs] #34433 [Core Tor/Tor]: Replace clang-format.sh with a faster, better version

[Tor Bug Tracker & Wiki]

#34433: Replace clang-format.sh with a faster, better version
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     Reporter:  nickm         |      Owner:  nickm
         Type:  enhancement   |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.4.4.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  c-style
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 We need to replace clang-format.sh with a version that meets our use-
 cases.

 Notably:

  * 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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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34433>
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