Format of HRLINE parameter block:
Offset	Size	Description	)
 00h	WORD	length of following data (multiple of 4)
 02h  2 WORDs	X,Y coordinates of starting point
 06h 2N WORDs	X,Y coordinates relative to the position of the previous point
		  for each of N points in polyline
Note:	on completion, the current position is set to the last point drawn
SeeAlso: #03907,#03897,#03900