Import .clang-format from InfiniTime and format sources

[muesli]

This should be a non-change from a compiler's perspective.

[NeroBurner]

Thanks!

How do I invoke clang format? and can I have a followup PR with a clang format check job in CI? pretty please 😁

[muesli]

How do I invoke clang format? and can I have a followup PR with a clang format check job in CI? pretty please 😁

clang-format -i main.cpp (for inline formatting instead of printing to stdout). CI changes coming up, probably in a separate PR.

[NeroBurner]

found a one-liner in bash to run on whole project (works thanks to your clang ignore file\

# when in InfiniSim root dir
find . -iname '*.h' -o -iname '*.cpp' | xargs clang-format -i