* CI/AppVeyor: Add appveyor.yml file * Build: Require Visual Studio 2019 16.4 or greater * CI/AppVeyor: Upgrade to VS2019 image * Update cmake error message * CI/AppVeyor: Fix appveyor VS 2019 configuration (cherry picked from commit 1df52da0b052654a9b42339fdd22028bfdbf9fc0)