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

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Add circular DMA support to STM32 and STM32 serial driver; Add initial configuration for the Mikroelektronika PIC32MX7 MMB board

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Extend the USB device/class interface:  Add parameters to pass the EP0 OUT data that should accompany the OUT SETUP request

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