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.

Tests/IncludeDirectories/SystemIncludeDirectories/systemlib/systemlib.h

@@ -5,12 +5,12 @@
 #ifdef _WIN32
 __declspec(dllexport)
 #endif
-int systemlib();
+  int systemlib();
 
 #ifdef _WIN32
 __declspec(dllexport)
 #endif
-int unusedFunc()
+  int unusedFunc()
 {
   int unused;
   return systemlib();