Merged requested to merge aj46ezos/emper:improve-parallel-logging into master
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.