libfmt
======
 * git clone https://github.com/gabime/spdlog.git
 * cd spdlog
 * git checkout v0.11.0
 * Install
   * include/spdlog
     * remove include/spdlog/fmt/bundled
 * Use with
   * SPDLOG_FMT_EXTERNAL
   * SPDLOG_DEBUG_ON
   * SPDLOG_WCHAR_FILENAMES