* Add preliminary support for arm-windows and arm64-windows triplets
Visual Studio 15.4 shipped with new VC tools targeting arm and arm64
for desktop. This change allows for recognition and usage of new
triplets supporting arm and arm64 Windows desktop and server targets.
* Remove unnecessary changes
* Part 2
* Part 3
* Make detection of Arm64 _VCPKG_TARGET_ARCHITECTURE precise
* Enforce usage of Visual Studio CMake generatorfor arm and temporarily arm64 targets
* Address code review feedback, clean libjpeg-turbo port.cmake
* [libjpeg-turbo][tiff] Reduce changes to existing libraries.
* [vcpkg-cmake] Simplify toolchain selection logic and improve comments
