Revise C++ coding style using clang-format

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.

Source/cmCustomCommandGenerator.h

@@ -28,10 +28,10 @@ class cmCustomCommandGenerator
   cmGeneratorExpression* GE;
   mutable bool DependsDone;
   mutable std::vector<std::string> Depends;
+
 public:
   cmCustomCommandGenerator(cmCustomCommand const& cc,
-                           const std::string& config,
-                           cmLocalGenerator* lg);
+                           const std::string& config, cmLocalGenerator* lg);
   ~cmCustomCommandGenerator();
   cmCustomCommand const& GetCC() const { return this->CC; }
   unsigned int GetNumberOfCommands() const;