Added support to the MIDI Class drivers for packed data, where multiple MIDI events are packed into a single USB packet. Added new MIDI Class driver flush routines to override packing behaviour.

Demos/Host/ClassDriver/MIDIHost/MIDIHost.c

@@ -203,6 +203,7 @@ void CheckJoystickMovement(void)
 			};
 			
 		MIDI_Host_SendEventPacket(&Keyboard_MIDI_Interface, &MIDIEvent);
+		MIDI_Host_Flush(&Keyboard_MIDI_Interface);
 	}
 
 	PrevJoystickStatus = JoystickStatus;