A mouse movement has occurred. 

 | Data byte | Description                                                                       | 
 | :---------: | -----------                                                                       | 
 | 0         | If zero absolute coordinates follow. If equal to one relative coordinates follow. | 
 | 1         | Zone for which event applies to (0-255). 255 is all zones                         | 
 | 2         | Sub-zone for which event applies to (0-255). 255 is all sub-zones                 | 
 | 3         | MSB of normalized X-coordinate.                                                   | 
 | 4         | LSB of normalized X-coordinate.                                                   | 
 | 5         | MSB of normalized Y-coordinate.                                                   | 
 | 6         | LSB of normalized Y-coordinate.                                                   | 
