call anim_clear
ret
+ ; marks the current actor's tile
+ ; as occupied by an actor
+ ; also removes the flag from the actor's current tile
+ ; this only works for the default case of
+ ; an acotr needing a single tile.
+ ; inputs:
+ ; bc: original y/x position ptr
+ ; anim_target_y/x: target position
+ ; returns:
+ ; sets the RF_ACTOR flag at target_y/x
+ ; unsets RF_ACTOR at [bc] and [bc+1]
+actor_tile_update_flag:
+ ret
+
; function ptrs for each actor type
; inputs:
; bc: actor ptr