issue #65: added macroses like SPDLOG_TRACE but with no force

added convinient macroses passing logging points; replaced force_log to log for SPDLOG_TRACE SPDLOG_DEBUG

Add async queue size as a separate parameter from sample size

Conflicts:
	example/bench.cpp

Updated cppformat to version 86a7d856fa03fb5ba96f1a27907a4b7171f42e56 and remove spdlog::details namespace from it's source

Under linux, use the much faster CLOCK_REALTIME_COARSE clock by default (SPDLOG_CLOCK_COARSE is defined in common.h)

coarse clock, short log level