Add start of an architecture port to the Atmel USB XMEGA devices.

LUFA.pnproj

LUFA/CodeTemplates/makefile_template.xmega

LUFA/Common/Architectures.h

LUFA/Common/Common.h

LUFA/Drivers/USB/Core/Device.h

LUFA/Drivers/USB/Core/Endpoint.h

LUFA/Drivers/USB/Core/EndpointStream.h

LUFA/Drivers/USB/Core/StdDescriptors.h

LUFA/Drivers/USB/Core/USBController.h

LUFA/Drivers/USB/Core/USBInterrupt.h

LUFA/Drivers/USB/Core/USBMode.h

LUFA/Drivers/USB/Core/XMEGA/Device_XMEGA.c

LUFA/Drivers/USB/Core/XMEGA/Device_XMEGA.h

LUFA/Drivers/USB/Core/XMEGA/EndpointStream_XMEGA.c

LUFA/Drivers/USB/Core/XMEGA/EndpointStream_XMEGA.h

LUFA/Drivers/USB/Core/XMEGA/Endpoint_XMEGA.c

LUFA/Drivers/USB/Core/XMEGA/Endpoint_XMEGA.h

LUFA/Drivers/USB/Core/XMEGA/Host_XMEGA.c

LUFA/Drivers/USB/Core/XMEGA/PipeStream_XMEGA.c

LUFA/Drivers/USB/Core/XMEGA/Pipe_XMEGA.c