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.
The actual file timestamp dependency is known to not work on
Visual Studio or Xcode generators. Tolerate such failure for
these generators (Tests/CustomCommand already covers using
OBJECT_DEPENDS to pull a custom command into a target, and
that still works with these generators).