Adds New PoI Features + Bonus PoI (#5796)

* Adds cliffs.

* Finishes lava and polishes the other things.

* Hopefully finished with all the new shinies.

code/game/objects/effects/map_effects/effect_emitter.dm

@@ -18,7 +18,7 @@
 	return ..()
 
 /obj/effect/map_effect/interval/effect_emitter/proc/configure_effects()
-	effect_system.set_up(effect_amount, effect_cardinals_only, usr.loc, effect_forced_dir)
+	effect_system.set_up(effect_amount, effect_cardinals_only, src.loc, effect_forced_dir)
 
 /obj/effect/map_effect/interval/effect_emitter/trigger()
 	configure_effects() // We do this every interval in case it changes.

code/game/objects/effects/map_effects/map_effects.dm

@@ -49,6 +49,7 @@
 		spawn(retry_delay) // Maybe someday we'll have fancy TG timers/schedulers.
 			if(!QDELETED(src))
 				.()
+		return
 
 	var/next_interval = rand(interval_lower_bound, interval_upper_bound)
 	spawn(next_interval)