Improvements

• Upgraded to latest fmt version 5.2.1.
• Binary data logging using spdlog::to_hex(binary_data). Many types of std::container<char> can be logged in hex. See usage examples.
• Added logger->clone() to ease the creation of new loggers from an existing one.
• Numerous micro optimizations across the lib.
• Added set_sinks method to dist_sink for atomic updating set of sinks in dist_sink. Thanks @jwnimmer-tri .
• Improved CmakeLists.txt to better handle third-party usage. Thanks @taketwo .

Fixes

• Fixed wchar logging (supported only in windows. #851 , #764).
• Fixed registry test. Thanks @DanielChabrowski .
• Removed invalid files from tests.sln. Thanks @yhchen .
• Some fixes to console_globals.h includes. Thanks @DanielChabrowski
• Don't deny access to log files from other processes under windows. Thanks @eruiz.
• Pessimizing move remove. Thanks @maciekgajewski
• ansicolor_sink.h - add missing sink include. Thanks @AlexanderDalshov .
• Improved rotating sink error handling.
• Fixed Readme. Thanks @blackball .
• Fixed some clang tidy warnings.