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Utilities/Release/WiX: Modify PATH by default when installing on Windows

Brad King requested to merge brad.king/cmake:rel-win-PATH into master

Enable the PATH modification checkbox by default to make our command-line tools available for all users. This is a common expectation.

Save the checkbox setting persistently in the Windows Registry and use the same choice by default in future installations.

In scripted installations using msiexec, honor ADD_CMAKE_TO_PATH={0,1} if it is given on the command line. Otherwise, honor the registry value from an existing installation, if any. Otherwise, fall back to the new default and enable PATH modification.

Fixes: #21465 (closed)

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