Configure NSIS-packaged CMake version and install destination

Remove the version number from the default package install destination.
An unversioned default allows users to upgrade their CMake installations
without manually re-generating all their build trees to update the path
to CMake.  Users can select a versioned directory name on installation
if they wish.

Also name the package with the full CMake version number so it is clear
exactly what version is going to be installed.  This is particularly
helpful for the nightly binary installers.

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