STM32 F1 USB device:  Fix handling of EP0 start for large buffers; Add support for decoded USB trace strings.  From Davice Sidrane

Extend stack debug logic to include IDLE and interrupt stacks.  Also color the heap as well.  Based on suggestions from David Sidrane

arch/arm/src/stm32/stm32_usbdev.c: On a failure to bind the class driver, the driver reference was being nullified too soon.  This caused an exception in usbdev_reset() later.  The driver reference will be null
ified later usbdev_unregister when the caller gets the error.  From David Sidrane

SAMA5: Add ADC-side of the logic to hook in timer/counter logic needed to drive  periodic ADC sampling