[core] Restored logger perf improvements that were blocked up to 1.6.0 #2900
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This restores the performance improvements in the logging system.
This time any modification of the logger configuration is updated immediately in all loggers. Therefore the
CheckEnabled()
function, which is called every time a log has to be printed (no matter if it's going to be printed or not), this time just returns a boolean flag. This flag is kept in sync with the configuration, but only at the time when the configuration is changed.