reorder headers

Reordering all the headers to the following structure:

header file:
local
c
cpp (including openbmc libraries)

source file:
source.hpp (if applicable)
local
c
cpp

Change-Id: Ia74a5c761a3029819366159de3cfd40c5e4c4a2c
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/argument.hpp b/argument.hpp
index ad63cf9..94fdbd6 100644
--- a/argument.hpp
+++ b/argument.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <getopt.h>
+
 #include <map>
 #include <string>