Move math and some file and data conversion files out from native to Common.

Buildfixing

Move some file util files

Buildfix

Move KeyMap.cpp/h to Core where they belong better.

libretro buildfix attempt

Move ini_file

More buildfixes

UI/BackgroundAudio.cpp

@@ -1,11 +1,11 @@
 #include <string>
 #include <mutex>
 
-#include "file/chunk_file.h"
-#include "file/vfs.h"
+#include "Common/File/VFS/VFS.h"
 #include "ui/root.h"
 
 #include "Common/CommonTypes.h"
+#include "Common/Data/Format/RIFF.h"
 #include "Common/Log.h"
 #include "Common/Serialize/SerializeFuncs.h"
 #include "Common/TimeUtil.h"