Destroy several sources of lag (#21422)

Destroys a ton of sources of lag:

- /obj/machinery/biogenerator/interact and
/obj/machinery/computer/rdconsole/attack_hand

Both of these call REF(src) constantly on their UI update, which also
happens constantly. Death by a thousand cuts

- /obj/machinery/button/ignition/attack_hand and
/obj/machinery/button/switch/holosign/attack_hand

Sleeps rather than timers, iterating the entire machinery list rather
than just storing the IDs we need at roundstart

- /obj/machinery/telecomms/update_icon and /obj/machinery/meter/process

Calling overlay updates WAY TOO MUCH. UpdateOverlays is a significant
overhead for the server at this point and the two of these combined are
responsible for a little over 20% of updates. They now should only
update overlays when necessary rather than every tick.

- NEW! /obj/machinery/disposal/proc/update and
/obj/machinery/portable_atmospherics/hydroponics/update_icon

These two were also offenders, worse than telecomms but better than
meters. They have also been brought into line.

- /mob/living/carbon/slime

Hard-del'd if grinded into slime extract less than two minutes after
being "born". Fixed by adding TIMER_DELETE_ME flag.

---------

Co-authored-by: Matt Atlas <liermattia@gmail.com>

code/modules/organs/organ.dm

@@ -436,7 +436,10 @@ INITIALIZE_IMMEDIATE(/obj/item/organ)
 	var/obj/item/organ/external/affected = owner.get_organ(parent_organ)
 	if(affected) affected.internal_organs -= src
 
-	loc = get_turf(owner)
+	var/turf/T = get_turf(owner)
+	// to avoid brains and things like that getting put into nullspace and thus entering spatial grids
+	if(!isnull(T))
+		loc = T
 	START_PROCESSING(SSprocessing, src)
 	rejecting = null
 	if (!reagents)