Replace include guards with pragma once

include/PSX/Overlay/overlay_declaration.hpp

@@ -1,10 +1,8 @@
-#ifndef __JABYENGINE_OVERLAY_DECLARATION__HPP__
-#define __JABYENGINE_OVERLAY_DECLARATION__HPP__
+#pragma once
 
 // No include here because this header should be included in a namespace and we don't want multiple namespace definitions of OverlayHeader and OverlayLBA
 
 #include "../AutoLBA/auto_lba_declaration.hpp"
 
 #define __declare_overlay_header(function, enum_struct) \
-__declare_lba_header(enum_struct)
-#endif //!__JABYENGINE_OVERLAY_DECLARATION__HPP__
+__declare_lba_header(enum_struct)