first pass at adding logging framework

external/spdlog/src/async.cpp

@@ -0,0 +1,13 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#ifndef SPDLOG_COMPILED_LIB
+#error Please define SPDLOG_COMPILED_LIB to compile this file.
+#endif
+
+#include <spdlog/async.h>
+#include <spdlog/async_logger-inl.h>
+#include <spdlog/details/periodic_worker-inl.h>
+#include <spdlog/details/thread_pool-inl.h>
+
+template class SPDLOG_API spdlog::details::mpmc_blocking_queue<spdlog::details::async_msg>;