Update cmake for use with CentOS 8 rpms
* Update Findspdlog.cmake script to use spdlog's own cmake scripts * Add linking to spdlog::spdlog to all deimos targets * Clean up and update Findphobos.cmake
* Update Findspdlog.cmake script to use spdlog's own cmake scripts * Add linking to spdlog::spdlog to all deimos targets * Clean up and update Findphobos.cmake