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

headless/WindowsHeadlessHost.cpp

@@ -21,8 +21,8 @@
 
 #include "gfx/gl_common.h"
 #include "gfx_es2/gpu_features.h"
-#include "file/vfs.h"
-#include "file/zip_read.h"
+#include "Common/File/VFS/VFS.h"
+#include "Common/File/VFS/AssetReader.h"
 
 #include "Common/CommonWindows.h"
 #include "Common/Log.h"