Moved LazarusBlip's revival after offscreen to superclass Blip with new enum OffscreenBehavior.
Created new OffscreenBehaviors KILL and NONE
Created onOffscreen() function.
DeathBlip's offscreenBehavior is now OffscreenBehavior.RANDOMIZE_POSITION
fixed a bug where LazarusBlip would no longer die after having been revived once