Bringing USB files in name of JcB

cores/arduino/USB/CDC.cpp

cores/arduino/USB/HID.cpp

cores/arduino/USB/USBAPI.h

cores/arduino/USB/USBCore.cpp

cores/arduino/USB/USBCore.h

cores/arduino/USB/USBDesc.h

cores/arduino/USB/USB_device.h

cores/arduino/USB/USB_host.h

cores/arduino/USB/samd21_device.c

cores/arduino/USB/samd21_device.h

cores/arduino/USB/samd21_host.c

cores/arduino/USB/samd21_host.h

cores/arduino/validation_usb_device/build_as6/test.atsln

cores/arduino/validation_usb_device/build_as6/test.atsuo

cores/arduino/validation_usb_device/build_as6/test.cppproj

cores/arduino/validation_usb_device/build_gcc/Makefile

cores/arduino/validation_usb_device/build_gcc/debug.mk

cores/arduino/validation_usb_device/build_gcc/gcc.mk

...rduino/validation_usb_device/build_gcc/test_usb_device.mk

cores/arduino/validation_usb_device/test_usb_device.cpp