Merge pull request #5251 from Fox-McCloud/fire-system

Implements Fire System

code/controllers/Processes/fires.dm

@@ -0,0 +1,23 @@
+var/global/datum/controller/process/fire/fire_master
+
+/datum/controller/process/fire
+	var/list/burning = list()
+
+/datum/controller/process/fire/setup()
+	name = "fire"
+	schedule_interval = 20 //every 2 seconds
+	fire_master = src
+	log_startup_progress("Fire process starting up.")
+
+/datum/controller/process/fire/statProcess()
+	..()
+	stat(null, "[burning.len] burning objects")
+
+/datum/controller/process/fire/doWork()
+	for(var/obj/burningobj in burning)
+		if(burningobj.burn_state == ON_FIRE)
+			if(burningobj.burn_world_time < world.time)
+				burningobj.burn()
+				SCHECK
+		else
+			burning.Remove(burningobj)