Resets the parser.
When called, the parser flushes all its buffers, firing events as necessary, and then initializes itself to its default state.
Reset must also be used as signal to the parser that the current stream of text has terminated.
This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)