Mob life fix, firedoors

This commit does the following;
 - Repairs mob breathing by adding a new ticker process, mob_master, as
   air_master is an unreliable ticker with it's customizable speed
 - Restore firedoor attack_hand access
  - You can now open and close firedoors by using no item, provided you
    have access to them and they aren't locked.

code/controllers/Processes/mob.dm

@@ -5,6 +5,9 @@
 	name = "mob"
 	schedule_interval = 20 // every 2 seconds
 	updateQueueInstance = new
+	if(!mob_master)
+		mob_master = new
+		mob_master.Setup()
 
 /datum/controller/process/mob/started()
 	..()
@@ -18,3 +21,17 @@
 	if(updateQueueInstance)
 		updateQueueInstance.init(mob_list, "Life")
 		updateQueueInstance.Run()
+		mob_master.process()
+
+var/global/datum/controller/mob_system/mob_master
+
+/datum/controller/mob_system
+	var/current_cycle
+	var/starttime
+
+/datum/controller/mob_system/proc/Setup()
+	world << "\red Mob ticker starting up."
+	starttime = world.timeofday
+
+/datum/controller/mob_system/proc/process()
+	current_cycle++