Merge pull request #4388 from Citadel-Station-13/upstream-merge-33517

[MIRROR] SSinput tweaks to address server side lag

code/controllers/subsystem/input.dm

@@ -0,0 +1,12 @@
+SUBSYSTEM_DEF(input)
+	name = "Input"
+	wait = 1 //SS_TICKER means this runs every tick
+	flags = SS_TICKER | SS_NO_INIT
+	priority = 1000
+	runlevels = RUNLEVELS_DEFAULT | RUNLEVEL_LOBBY
+
+/datum/controller/subsystem/input/fire()
+	var/list/clients = GLOB.clients // Let's sing the list cache song
+	for(var/i in 1 to clients.len)
+		var/client/C = clients[i]
+		C.keyLoop()