Replace static global std::string arrays by Meyer singletons. This improves thread-safety.
Replace static global std::string arrays by Meyer singletons. This improves thread-safety.

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