deterministic explosion system (#13392)

* wae explosions

* okay

* changes

* fixes

* fix

* ok

* ok

* kills more dead code

* okay

* fix

* ok

* tiles

* ok

* okay

* woops

* ok

* fix

* okay

* mob damage

* fixes

* insanity

* more

* more

* fixes

* more

* woot

* don't commit that

* YES

* fix

code/modules/antagonists/revenant/revenant.dm

@@ -177,6 +177,9 @@
 /mob/living/simple_animal/revenant/ex_act(severity, target)
 	return 1 //Immune to the effects of explosions.
 
+/mob/living/simple_animal/revenant/wave_ex_act(power, datum/wave_explosion/explosion, dir)
+	return power
+
 /mob/living/simple_animal/revenant/blob_act(obj/structure/blob/B)
 	return //blah blah blobs aren't in tune with the spirit world, or something.