Codechange: rename smallvec_type to container_func and use only when needed

src/music/midifile.cpp

@@ -12,6 +12,7 @@
 #include "../fileio_type.h"
 #include "../string_func.h"
 #include "../core/endian_func.hpp"
+#include "../core/mem_func.hpp"
 #include "../base_media_base.h"
 #include "midi.h"
 

src/music/midifile.hpp

@@ -11,7 +11,6 @@
 #define MUSIC_MIDIFILE_HPP
 
 #include "../stdafx.h"
-#include "../core/smallvec_type.hpp"
 #include "midi.h"
 
 struct MusicSongInfo;

src/music/win32_m.cpp

@@ -17,6 +17,7 @@
 #include "midifile.hpp"
 #include "midi.h"
 #include "../base_media_base.h"
+#include "../core/mem_func.hpp"
 #include <mutex>
 
 #include "../safeguards.h"