Last release (?) with C++14 support. From now on master will be on C++17/20

This is a release to give the latest changes for the C++14 community.
After this change master will be on C++17/20.

Minor cleanups

• compiler warnings, mingw cmake support, typo fixes #389, #390 @alvin-777
• documentation change #378 @xiaotianrandom
• bugfix vsnprintf_s, typo fixes #373, #365, #363 @shiyuge
• documentation improvements #359 @xgdgsc