Implement waitReadable and waitByteTime on Windows #269
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Add a FILE_FLAG_OVERLAPPED flag when open the port Revise the Read and Write method to support Asynchronous I/O
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In order to implement timeout function of waitReadable, MS Asynchronized I/O feature is introduced with FILE_FALG_OVERLAPPED flag of CreateFileW method.
Both read and write method have been refactored to support asynchronized I/O.
I have briefly tested it with test_serial subproject. It seems work fine. Looking forward to more testing.