Update UC3 platform driver support to use the bitmasks defined in the header files over raw constants.

Start implementation of XMEGA platform drivers.

More XMEGA USB AVR device port work - re-add missing Endpoint stream functions, remove unnecessary internal functions.

MultiArchDemos: Correct usage of updated INTC_RegisterGroupHandler() in the ported demos.

Added Device Qualifier standard descriptor structure definitions USB_StdDescriptor_DeviceQualifier_t and USB_Descriptor_DeviceQualifier_t.

Add device support preprocessor checks and use symbolic bit names in the UC3 platform clock management driver.

Fix compile errors in the UC3 platform support due to a forward reference and an incorrect function prototype.

Remove unneeded #include of Device.h in StdDescriptors.h breaking compilation for some user projects.

Fixed error in the pipe unordered allocation algorithm for the AVR8 devices breaking compatibility with some devices.

Fix incorrect standard request name in the host standard request driver.

Fix duplicated LED driver functions in the Doxygen documentation.

Add endianness information to the class driver and core structure definitions.

Move out the unused Ethernet_Frame_Info_t structure definition to the RNDIS device demos where it is needed.

Replace blind interface descriptor search in the incomplete AndroidAccessoryHost demo with an intelligent search for the correct interface in the device matching the correct class/subclass/protocol values.

Updated all host mode demos and projects to use the EVENT_USB_Host_DeviceEnumerationComplete() event callback for device configuration instead of manual host state machine manipulations in the main application task.

Added new USB_Host_ConfigurationNumber global variable to indicate the selected configuration in an attached device.

Renamed global state variables that are specific to a certain USB mode to clearly indicate which mode the variable relates to, by changing the USB_* prefix to USB_Device_* or USB_Host_*.

Removed the HOST_STATE_WaitForDeviceRemoval and HOST_STATE_Suspended host state machine states, as these are no longer required.

Altered the USB_Host_SetDeviceConfiguration() function to update the new USB_Host_ConfigurationNumber global as required.

Moved out the Host mode standard request convenience/helper functions from the architecture specific Host driver files to the architecture agnostic HostStandardReq.c driver file.

Tighten up the implementations of the USB_Device_SetDeviceAddress(), USB_Controller_Reset() and USB_PLL_On() functions for the AVR8 devices.

Minor corrections to the documentation of the USB_Control_Request_t enum.

Slight improvements to the ADC peripheral driver example in the manual.

Split out compiler specific helper macros into a new CompilerSpecific.h header file inside the library, for future expansion.

Add the GCC -fno-split-wide-types compile time option to some of the larger user projects to reduce the compiled application size.

Fix HID_Host_SetIdlePeriod() function to send the correct request type to the device, remove reference to unavailable (and not needed) local variable.

Switch the HTTP Webserver project to use the safer strlcpy() instead of strncpy() to save on manual null-termination.