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[log] improve timestamp scalability and increase LogBuffer size

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Merged Florian Fischer requested to merge aj46ezos/emper:improve-parallel-logging into master Sep 27, 2021
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std::localtime takes a global lock and is therefore not scalable and inapplicable for analyzing timing sensible bugs. Introduce a new option to add UTC timestamps. This allows on my system to double the CPU load while using mmapped logging.

Also increase the LogBuffer size from 1MB to 1GB because I had some crashes where a renewed buffer was still used.

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Source branch: improve-parallel-logging