Copyright.txt: Add notice of copyright by contributors
We do not require copyright assignment for contributions to CMake. Update the top-level notice to mention "Contributors" explicitly. Add a list of the Contributors whose names already appear in source-level copyright notices. Find the list with the command: $ git grep -h 'Copyright[^.]' -- *.* \ Auxiliary Modules Packaging Source Templates Tests \ | grep -v Kitware | sed 's/^#\? *//' | sort | uniq Manually refine the list to de-duplicate entries and filter out notices from third-party code.
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