Format include directive blocks and ordering with clang-format

Sort include directives within each block (separated by a blank line) in
lexicographic order (except to prioritize `sys/types.h` first).  First
run `clang-format` with the config file:

    ---
    SortIncludes: false
    ...

Commit the result temporarily.  Then run `clang-format` again with:

    ---
    SortIncludes: true
    IncludeCategories:
      - Regex:    'sys/types.h'
        Priority: -1
    ...

Commit the result temporarily.  Start a new branch and cherry-pick the
second commit.  Manually resolve conflicts to preserve indentation of
re-ordered includes.  This cleans up the include ordering without
changing any other style.

Use the following command to run `clang-format`:

    $ git ls-files -z -- \
        '*.c' '*.cc' '*.cpp' '*.cxx' '*.h' '*.hh' '*.hpp' '*.hxx' |
      egrep -z -v '(Lexer|Parser|ParserHelper)\.' |
      egrep -z -v '^Source/cm_sha2' |
      egrep -z -v '^Source/(kwsys|CursesDialog/form)/' |
      egrep -z -v '^Utilities/(KW|cm).*/' |
      egrep -z -v '^Tests/Module/GenerateExportHeader' |
      egrep -z -v '^Tests/RunCMake/CommandLine/cmake_depends/test_UTF-16LE.h' |
      xargs -0 clang-format -i

This selects source files that do not come from a third-party.

Inspired-by: Daniel Pfeifer <daniel@pfeifer-mail.de>

Tests/Tutorial/Step1/tutorial.cxx

@@ -1,8 +1,8 @@
 // A simple program that computes the square root of a number
+#include "TutorialConfig.h"
+#include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <math.h>
-#include "TutorialConfig.h"
 
 int main (int argc, char *argv[])
 {

Tests/Tutorial/Step2/MathFunctions/mysqrt.cxx

@@ -1,5 +1,5 @@
-#include <stdio.h>
 #include "MathFunctions.h"
+#include <stdio.h>
 
 // a hack square root calculation using simple operations
 double mysqrt(double x)

Tests/Tutorial/Step2/tutorial.cxx

@@ -1,8 +1,8 @@
 // A simple program that computes the square root of a number
+#include "TutorialConfig.h"
+#include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <math.h>
-#include "TutorialConfig.h"
 
 #ifdef USE_MYMATH
 #include "MathFunctions.h"

Tests/Tutorial/Step3/MathFunctions/mysqrt.cxx

@@ -1,5 +1,5 @@
-#include <stdio.h>
 #include "MathFunctions.h"
+#include <stdio.h>
 
 // a hack square root calculation using simple operations
 double mysqrt(double x)

Tests/Tutorial/Step3/tutorial.cxx

@@ -1,8 +1,8 @@
 // A simple program that computes the square root of a number
+#include "TutorialConfig.h"
+#include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <math.h>
-#include "TutorialConfig.h"
 
 #ifdef USE_MYMATH
 #include "MathFunctions.h"

Tests/Tutorial/Step4/MathFunctions/mysqrt.cxx

@@ -1,6 +1,6 @@
-#include <stdio.h>
 #include "MathFunctions.h"
 #include "TutorialConfig.h"
+#include <stdio.h>
 
 #include <math.h>
 

Tests/Tutorial/Step4/tutorial.cxx

@@ -1,8 +1,8 @@
 // A simple program that computes the square root of a number
+#include "TutorialConfig.h"
+#include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <math.h>
-#include "TutorialConfig.h"
 
 #ifdef USE_MYMATH
 #include "MathFunctions.h"

Tests/Tutorial/Step5/MathFunctions/MakeTable.cxx

@@ -1,6 +1,6 @@
 // A simple program that builds a sqrt table
-#include <stdio.h>
 #include <math.h>
+#include <stdio.h>
 
 int main (int argc, char *argv[])
 {

Tests/Tutorial/Step5/MathFunctions/mysqrt.cxx

@@ -1,6 +1,6 @@
-#include <stdio.h>
 #include "MathFunctions.h"
 #include "TutorialConfig.h"
+#include <stdio.h>
 
 // include the generated table
 #include "Table.h"

Tests/Tutorial/Step5/tutorial.cxx

@@ -1,8 +1,8 @@
 // A simple program that computes the square root of a number
+#include "TutorialConfig.h"
+#include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <math.h>
-#include "TutorialConfig.h"
 
 #ifdef USE_MYMATH
 #include "MathFunctions.h"

Tests/Tutorial/Step6/MathFunctions/MakeTable.cxx

@@ -1,6 +1,6 @@
 // A simple program that builds a sqrt table
-#include <stdio.h>
 #include <math.h>
+#include <stdio.h>
 
 int main (int argc, char *argv[])
 {

Tests/Tutorial/Step6/MathFunctions/mysqrt.cxx

@@ -1,6 +1,6 @@
-#include <stdio.h>
 #include "MathFunctions.h"
 #include "TutorialConfig.h"
+#include <stdio.h>
 
 // include the generated table
 #include "Table.h"

Tests/Tutorial/Step6/tutorial.cxx

@@ -1,8 +1,8 @@
 // A simple program that computes the square root of a number
+#include "TutorialConfig.h"
+#include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <math.h>
-#include "TutorialConfig.h"
 
 #ifdef USE_MYMATH
 #include "MathFunctions.h"

Tests/Tutorial/Step7/MathFunctions/MakeTable.cxx

@@ -1,6 +1,6 @@
 // A simple program that builds a sqrt table
-#include <stdio.h>
 #include <math.h>
+#include <stdio.h>
 
 int main (int argc, char *argv[])
 {

Tests/Tutorial/Step7/MathFunctions/mysqrt.cxx

@@ -1,6 +1,6 @@
-#include <stdio.h>
 #include "MathFunctions.h"
 #include "TutorialConfig.h"
+#include <stdio.h>
 
 // include the generated table
 #include "Table.h"

Tests/Tutorial/Step7/tutorial.cxx

@@ -1,8 +1,8 @@
 // A simple program that computes the square root of a number
+#include "TutorialConfig.h"
+#include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <math.h>
-#include "TutorialConfig.h"
 
 #ifdef USE_MYMATH
 #include "MathFunctions.h"