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.
This converts the CMake license to a pure 3-clause OSI-approved BSD
License. We drop the previous license clause requiring modified
versions to be plainly marked. We also update the CMake copyright to
cover the full development time range.
Brad King
Andy Cedilnik
Will Schroeder