A class for mouse position changes, packed into a primitive long. We utilize bitpacking in order to use primitive long arrays for space constraints.
the bitpacked long value, exposed as servers may wish to re-compose the position changes at a later date.
the time difference in milliseconds since the last transmitted mouse movement.
the x coordinate delta of the mouse, in pixels. If the mouse goes outside the client window, the value will be -1.
the y coordinate delta of the mouse, in pixels. If the mouse goes outside the client window, the value will be -1.