Without this compilation can fail in picojson.h because the PRId64 macro isn't defined (it is used to print 64bit ints).
GetWindow and SwapBuffers are function of Windows.h and using the same name causes a compile error. This commit also changes Util's GetProcTableAndDevice to CreateNXTDevice because we might need to call NXT procs when creating the C++ device.
More like squashed history, contributors were: - Kai Ninomiya - Corentin Wallez