Windows specific notes for JSON-C

Win32 Specific Changes:

• Use json_config.h.win32 to define Windows specific differences.
• Various functions have been redefined to their Win32 version (i.e. open on win32 is _open)
• Implemented missing functions from MS's libc (i.e. vasprintf)
• Added code to allow Win64 support without integer resizing issues, this probably makes it much nicer on 64bit machines everywhere (i.e. using ptrdiff_t for pointer math)

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