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  Name:     m_movement() - find out the direction mouse is moving
  Usage:    <integer> = m_movement()
  Params:   none
  Returns:  integer specifying direction the mouse is moving:

                 0 = no movement
                 1 = movement upwards
                 2 = movement to the right
                 3 = movement downwards
                 4 = movement to the right

 ---------------------------------- Example ---------------------------------

                 move_var = m_movement()

                 if move_var = 0
                      print(10,10,"Hey, we're not moving....")
                 elseif move_var = 1
                      print(10,10,"we're moving up....      ")
                 elseif move_var = 2
                      print(10,10,"we're moving right....   ")
                 elseif move_var = 3
                      print(10,10,"we're moving down....    ")
                 elseif move_var = 4
                      print(10,10,"we're moving left....    ")
                 endif