Use NuttX types in FreeModBus port; Add FreeModBus demo at apps/examples/modbus; Add new termios APIs

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NxWM: Finishes touchscreen implementation; NuttX: Standardize touchscreen initialization interfaces for all boards

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Add support for use of a USB serial device to provide NSH console I/O.  Verified on the Sure PIPIC32MX board

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Extend CDC/ACM driver so that can be connected/disconnected under software control; Add new NSH commands sercon and serdis that will connect and disconnect the CDC/ACM serial device

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readline() (and hence NSH) now accept the DEL character as well as the Backspace character for the backspace functionality

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Move lib/stdio/lib_fgets.c to apps/system/readline; simplify fgets(); use readline instead of fgets in NSH

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Get rid of psock.h (bad idea); Add logic to clone the socket structure when wrapping the telnet connection as a character driver

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