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>

3 files changed, 5 insertions, 6 deletions

diff --git a/Tests/FindGTK2/cairomm/main.cpp b/Tests/FindGTK2/cairomm/main.cpp
index ea8f106..0db3a04 100644
--- a/Tests/FindGTK2/cairomm/main.cpp
+++ b/Tests/FindGTK2/cairomm/main.cpp
@@ -8,11 +8,11 @@
 #define _USE_MATH_DEFINES
 #endif
 
-#include <string>
-#include <iostream>
-#include <cairommconfig.h>
 #include <cairomm/context.h>
 #include <cairomm/surface.h>
+#include <cairommconfig.h>
+#include <iostream>
+#include <string>
 
 #include <cmath>
 
diff --git a/Tests/FindGTK2/gtkmm/main.cpp b/Tests/FindGTK2/gtkmm/main.cpp
index 5ff64d1..566a4bd 100644
--- a/Tests/FindGTK2/gtkmm/main.cpp
+++ b/Tests/FindGTK2/gtkmm/main.cpp
@@ -1,5 +1,5 @@
-#include <gtkmm.h>
 #include "helloworld.h"
+#include <gtkmm.h>
 
 int main(int argc, char *argv[])
 {
diff --git a/Tests/FindGTK2/sigc++/main.cpp b/Tests/FindGTK2/sigc++/main.cpp
index 78428e7..ccf415e 100644
--- a/Tests/FindGTK2/sigc++/main.cpp
+++ b/Tests/FindGTK2/sigc++/main.cpp
@@ -1,8 +1,7 @@
 // Taken from https://developer.gnome.org/libsigc++-tutorial/stable/ch02.html
 
-
-#include <sigc++/sigc++.h>
 #include <iostream>
+#include <sigc++/sigc++.h>
 
 class AlienDetector
 {