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/cmUtilitySourceCommand.h

@@ -20,8 +20,8 @@ public:
   cmTypeMacro(cmUtilitySourceCommand, cmCommand);
   virtual cmCommand* Clone() { return new cmUtilitySourceCommand; }
   virtual bool InitialPass(std::vector<std::string> const& args,
-                           cmExecutionStatus &status);
-  virtual std::string GetName() const { return "utility_source";}
+                           cmExecutionStatus& status);
+  virtual std::string GetName() const { return "utility_source"; }
 };
 
 #endif