1. Newer VC runtime stat(), when using 32-bit file size, returns error
if file size is >2G. For file existence check, using 64-bit file
size is more accurate as files bigger than 2G would be reported as
non-existing otherwise.
2. <sys/stat.h> is required for VS2013 or before.
. Split AppleWin -> Core with the functionality really needed by the emulator.
. Split AppleWin -> Utilities for generic code not called by other emulator components.
. Split AppleWin -> CmdLine for the command line option parsing.
