added set_force_flush(bool) to simple file sink for performance benchmarks
added set_force_flush(bool) to simple file sink for performance benchmarks

hunter-packages/spdlog,icylord/spdlog,COMBINE-lab/spdlog,godbyk/spdlog,mihadyuk/spdlog,godbyk/spdlog,hunter-packages/spdlog,COMBINE-lab/spdlog,icylord/spdlog,COMBINE-lab/spdlog,icylord/spdlog,mihadyuk/spdlog,godbyk/spdlog,mihadyuk/spdlog,hunter-packages/spdlog