Summary

• Improvements in color output impl - thanks @Qix-
• Fixed spelling - thanks @rcarmich
• New function to convert level_enum from string - thanks @fegomes
• Support for custom EOL per formatter - thanks Emad William Farag
• Make set_color public in wincolor_sink to retain configurability - thanks Benjamin Schindler
• Fix compilation error with GCC 8 - thanks @ColinDuquesnoy
• CMake improvements - thanks @DanielChabrowski , @grzadr and @yisonPylkita
• Bumped bundled fmt version to 4.1.0
• Fixed tests for older gcc compilers
• Moved to clang source code formatter - thanks @DanielChabrowski
• Fixed many clang-tidy warnings - thanks @DanielChabrowski
• Fix implicit conversion warnings - thanks @tbastos
• Added Added: g3log, log4cplus, log4cpp, p7. Changes: boost, easylogging, g2log to bench - thanks @kasru
• Support for color formatting. using the %^ and %$ format flags.
• Added new sink to contrib: step_logger - thanks @Puasonych
• Replaced the lockfree queue with bounded, locked queue - this greatly improves CPU usage and memory footprint in async mode (with some cost to latency due to the mutex locking).