Commit of new class abstraction APIs for all device demos other than the MIDI demo - not documented yet.

Removed scheduler and memory allocation libraries.

Added new EVENT_USB_StartOfFrame event in the library to indicate the start of each USB frame (when generated).

Removed Tx interrupt from the USBtoSerial demo; now sends characters via polling to ensure more time for the Rx interrupt.

LUFA/Drivers/USB/HighLevel/USBTask.c

@@ -42,7 +42,7 @@ USB_Request_Header_t USB_ControlRequest;
 volatile uint8_t   USB_HostState;
 #endif
 
-TASK(USB_USBTask)
+void USB_USBTask(void)
 {
 	#if defined(USB_HOST_ONLY)
 		USB_HostTask();