Request: allow True Tile instead of Tile on Slayer plugin

The Slayer plugin currently gives the option of highlighting the tile or the outline of NPCs corresponding to your slayer task. It would be helpful to use True Tile in the case of certain slayer monster or bosses. 

For example, for Araxytes task, you may want to use True tile on the exploding Araxyte so you know when to move. It's harder to gauge with normal tile.