makes some instances of x^y into x**y because thats what exponents are in dm (#60050)

caught by monster at yogstation13/Yogstation#11703
probably not intended, 2^15 = 13 in dm so dont call this proc more than 13 times sequentially i guess

I have a suspicion that it doesn't matter assuming it gets caught by tick_usage being different but just in case

also fixes two other instances in code shown to me by mso

code/__HELPERS/files.dm

@@ -84,7 +84,7 @@
 	var/static/notch = 0
 	// its importaint this code can handle md5filepath sleeping instead of hard blocking, if it's converted to use rust_g.
 	var/filename = "tmp/md5asfile.[world.realtime].[world.timeofday].[world.time].[world.tick_usage].[notch]"
-	notch = WRAP(notch+1, 0, 2^15)
+	notch = WRAP(notch+1, 0, 2**15)
 	fcopy(file, filename)
 	. = md5filepath(filename)
 	fdel(filename)

code/modules/events/ghost_role.dm

@@ -25,7 +25,7 @@
 			if(control && control.occurrences > 0) //Don't refund if it hasn't
 				control.occurrences--
 			return
-		var/waittime = 300 * (2^retry)
+		var/waittime = 300 * (2**retry)
 		message_admins("The event will not spawn a [role_name] until certain \
 			conditions are met. Waiting [waittime/10]s and then retrying.")
 		addtimer(CALLBACK(src, .proc/try_spawning, 0, ++retry), waittime)

code/modules/power/lighting.dm

@@ -434,7 +434,7 @@
 			if(rigged)
 				if(status == LIGHT_OK && trigger)
 					explode()
-			else if( prob( min(60, (switchcount^2)*0.01) ) )
+			else if( prob( min(60, (switchcount**2)*0.01) ) )
 				if(trigger)
 					burn_out()
 			else