This routine moves to the first location specified in vector list, and then draws lines between the rest of coordinates in the list. The vector list has the following format:
rel y, rel x, rel y, rel x, ...
Draw_VL_d starts at the (y,x) coordinates specified in the D register and ignores the first pair of coordinates in the vector list.
DP = $D0
$C823 = number of vectors to draw
D-reg = start coordinate (Draw_VL_d only)
X-reg points to the vector list (2,X for Mov_Draw_VL_d)
X-reg points to next byte after list
D-reg, X-reg trashed