Reconfigure Cirrus to use clang 7 (#905)
Reconfigure Cirrus to use clang 7 (#905)

clang-format 5.0 formats ObjC files differently than newer versions, which results in the CI failing the format check for PRs formatted locally with a recent clang version.

The latest clang version available on the Ubuntu repositories for the Cirrus machines is 7, upgrading to that seems to be consistent with what I locally get with clang-format 8.0.

This PR also reformats all files with the new clang style.

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