Retire Windows 7 support #185
Description
Windows 7 reached end of life as of Jan 2020. I've left support for some time building using _WIN32_WINNT=0x0601;_WIN7_PLATFORM_UPDATE. I could change it to _WIN32_WINNT=0x0603 to require Windows 8.1 or later.
Windows 8.1 end of life was Jan 2023, but I'm going to start with removing Windows 7 before getting that aggressive.
When both Windows 7 and Windows 8.1 are removed, I can deprecate the directxmesh_desktop_2019 NuGet package in favor of directxmesh_desktop_win10