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VS: Select latest available Windows SDK version by default

Brad King requested to merge brad.king/cmake:vs-sdk-selection into master

Add policy CMP0149 to stop preferring SDKs exactly matching CMAKE_SYSTEM_VERSION over the latest SDK. See the policy documentation for motivation.

Add a version= field to CMAKE_GENERATOR_PLATFORM to explicitly control the SDK version selection without relying on CMAKE_SYSTEM_VERSION. Allow this field to be set to either an exact SDK version, or in VS 2019+, to just 10.0 to let VS select an exact version.

If no explicit version= field is specified, check the WindowsSDKVersion environment variable established by vcvarsall.bat or similar scripts. This is similar to how we check a VS##0COMNTOOLS environment variable to select a CMAKE_GENERATOR_INSTANCE for VS.

Fixes: #16202 (closed), #16713 (closed), #17992 (closed), #21403 (closed)

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