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/LowLevel/LowLevel.h

@@ -350,6 +350,9 @@
 				  return USB_MODE_HOST;
 			}
 			#endif
+		
+		/* External Variables: */
+			extern volatile bool FrameElapsed;
 			
 	#endif