normalize header guards to {tu_name}_H_ (#87)

i previously had a bad habit of using double underscores in include
guard macro names, which are implementation-reserved per
the C++98 standard (see 17.4.3.1.2 Global names).

Co-authored-by: Pheenoh <pheenoh@gmail.com>

include/d/d_save/d_save/d_save.h

@@ -1,5 +1,5 @@
-#ifndef __D_SAVE_H_
-#define __D_SAVE_H_
+#ifndef D_SAVE_H_
+#define D_SAVE_H_
 
 #include "SComponent/c_xyz/c_xyz.h"
 #include "d/d_meter2/d_meter2_info/d_meter2_info.h"

include/d/d_save/d_save_init/d_save_init.h

@@ -1,5 +1,5 @@
-#ifndef __D_SAVE_INIT_H__
-#define __D_SAVE_INIT_H__
+#ifndef D_SAVE_INIT_H_
+#define D_SAVE_INIT_H_
 
 extern "C" {
 void setInitEventBit();