code: Use std::span where appropriate (#6658)

* code: Use std::span when possible

* code: Prefix memcpy and memcmp with std::

src/citra_qt/dumping/dumping_dialog.h

@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <memory>
+#include <vector>
 #include <QDialog>
 #include "core/dumping/ffmpeg_backend.h"