Fullscreen overlay rework, full-black unconsciousness overlay, overlay fadeout animations + more. (#10053)

Ported the clickcatcher from tg/bay. You can now click black spots to turn. Isn't that handy, especially with vision cones.

    Reworked fullscreen overlays into an easier and better system, courtesy of PsiOmegaDelta.

    Similiarly, added fadeout animations to all pain overlays, plus unconsciousness.

    Fixed the vampire frenzy overlay never showing.

    Unconsciousness is now FULL darkness.

    Flashing mobs is now an inbuilt proc.

code/game/objects/items/devices/flash.dm

@@ -71,14 +71,14 @@
 			var/mob/living/carbon/C = M
 			var/datum/dionastats/DS = C.get_dionastats()
 			DS.stored_energy += 10
-			flick("e_flash", M.flash)
+			M.flash_eyes()
 			M.Weaken(5)
 			M.eye_blind = 5
 			return
 
 		var/safety = M:eyecheck(TRUE)
 		if(safety <= 0)
-			flick("e_flash", M.flash)
+			M.flash_eyes()
 			M.confused = 10
 			var/mob/living/carbon/human/H = M
 			var/obj/item/organ/internal/eyes/E = H.get_eyes()
@@ -191,7 +191,7 @@
 				var/mob/living/carbon/M = loc
 				var/safety = M.eyecheck(TRUE)
 				if(safety < FLASH_PROTECTION_MODERATE)
-					flick("e_flash", M.flash)
+					M.flash_eyes()
 					for(var/mob/O in viewers(M, null))
 						O.show_message("<span class='disarm'>[M] is blinded by the flash!</span>")
 	..()

code/game/objects/items/weapons/grenades/flashbang.dm

@@ -50,7 +50,7 @@
 
 //Flashing everyone
 	if(eye_safety < FLASH_PROTECTION_MODERATE)
-		flick("e_flash", M.flash)
+		M.flash_eyes()
 		M.Weaken(10)
 			//Vaurca damage 15/01/16
 		var/mob/living/carbon/human/H = M

code/game/objects/items/weapons/grenades/spawnergrenade.dm

@@ -20,7 +20,7 @@
 		if (flash)
 			for(var/mob/living/carbon/human/M in viewers(T, null))
 				if(M.eyecheck(TRUE) < FLASH_PROTECTION_MODERATE)
-					flick("e_flash", M.flash)
+					M.flash_eyes()
 		else
 			spark(T, 3, alldirs) //give spawning some flair if there's no flash
 

code/game/objects/items/weapons/vaurca_items.dm

@@ -206,7 +206,7 @@
 		playsound(T, 'sound/effects/phasein.ogg', 100, 1)
 		for(var/mob/living/carbon/human/M in viewers(T, null))
 			if(M.eyecheck(TRUE) < FLASH_PROTECTION_MODERATE)
-				flick("e_flash", M.flash)
+				M.flash_eyes()
 
 		for(var/i=1, i<=deliveryamt, i++)
 			var/obj/machinery/portable_atmospherics/hydroponics/soil/invisible/x = new spawner_type(T, new /datum/seed/koisspore())