510 Improved Overlays

Fixes auto blindness and no click on 510 servers, lessens the lag of
mesons and material scanners, and I suspect the general speed as well.

I only made it work for Polaris (and by extention, to our server, Eros),
and adapted it a bit.

Ported from:

7c2cc890ab

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

@@ -80,7 +80,7 @@
 					flash_strength *= H.species.flash_mod
 				if(flash_strength > 0)
 					M.Weaken(flash_strength)
-					flick("e_flash", M.flash)
+					M.flash_eyes()
 			else
 				flashfail = 1
 
@@ -158,7 +158,7 @@
 		var/safety = M:eyecheck()
 		if(!safety)
 			if(!M.blinded)
-				flick("flash", M.flash)
+				M.flash_eyes()
 
 	return
 
@@ -177,7 +177,7 @@
 				var/safety = M.eyecheck()
 				if(safety <= 0)
 					M.Weaken(10)
-					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>")
 	..()