Added handling of serial port DCB for Windows #316
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fixes #315
On Windows systems, it seems to depend on the driver resp. serial port hardware if a simple call of
EscapeCommFunction()is enough. If the fDtrControl or fRtsControl in the DCB is in the wrong state, it may fail to set it as desired.see https://docs.microsoft.com/en-us/windows/win32/api/winbase/ns-winbase-dcb#members
Furthermore, I've tried to simplify the Linux version which allows to directly set/clear the bits with the
ioctl()function, according to https://linux.die.net/man/4/tty_ioctl