Lets come up with a clang-format configuration that formats the code into the ascii art of our current preference and stick to it.
Reformat the current source, fully (--commit-author "clang-format <drivers@mongodb.com>") so we can stick it into pre-commit hook.

The server did something similar recently. We might steal their configuration if reasonable.

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remember to remove https://github.com/mongodb/mongo-c-driver/blob/master/src/mongoc/uncrustify.cfg and https://github.com/mongodb/mongo-c-driver/blob/master/src/mongoc/indent after the switch

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http://zed0.co.uk/clang-format-configurator/