Get ready for linux build

include/hex.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <cstdint>
+#include <cstddef>
 
 using u8    = std::uint8_t;
 using u16   = std::uint16_t;

include/views/view_hexeditor.hpp

@@ -1,8 +1,5 @@
 #pragma once
 
-#include <windows.h>
-#include <shobjidl.h>
-
 #include "utils.hpp"
 #include "views/view.hpp"