Run the `Utilities/Scripts/clang-format.bash` script to update
all our C++ code to a new style defined by `.clang-format`.
Use `clang-format` version 3.8.
* If you reached this commit for a line in `git blame`, re-run the blame
operation starting at the parent of this commit to see older history
for the content.
* See the parent commit for instructions to rebase a change across this
style transition commit.
Add cm_jsoncpp_value.h and cm_jsoncpp_writer.h headers to include the
CMake-provided copy of the json/value.h and json/writer.h headers from
CMake sources.
Kitware Robot
Brad King