* [directxtex] Use CMake build system and add OpenEXR support
Use the provided CMake file instead of the VS solutions to build the library, as recommended in the vcpkg maintainer guide.
Also add the openexr feature to enable OpenEXR in the library and its tools.
https://github.com/Microsoft/DirectXTex/wiki/Adding-OpenEXR
* [directxtex] Fix build failure on ARM and UWP
* [directxtex] Use vcpkg_copy_tools
* [directxtex] Add win7 feature
DirectXTex can be build without DirectX12 to support Windows 7 Service Pack 1 or later platforms, so I added this as a feature.
* [directxtex] Replace win7 with dx12 feature
* [directxrex] Shorten patch file
* [directxtex] Fix wrong port version
* [directxtex] Use ninja
