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
From the same author. Most importantly, reads numbers as doubles rather
than as signed ints and floats. This allows us to actually read 32 bit
unsigned int parameters.
Moved all the native customization to a separate json_reader.cpp.