fixes sentry bot issues, also mechs, mirrors, medibot and pod

- add: Forcing the sentry bot off the zlevel (via teleport gun, or
otherwise) will cause both it and the depot to self-destruct. TESTED
- add: Syndie redsuit is now a possible loot spawn. TESTED
- add: Deliberate self-destructs (e.g: releasing engine) now cause a
nuclear siren TESTED
- add: Door control console now gives feedback on use TESTED
- add: Bringing a mech to the depot now causes the alert level to
increase faster TESTED
- fix: misplaced bot laws poster TESTED
- fix: mirrors being draggable TESTED
- fix: bot leaving two corpses on death TESTED
- fix: syndie medbot not having syndicate faction, causing syndie mobs
to attack it TESTED
- fix: syndicate pod incorrectly showing up as civilian pod TESTED
- fix: sentry bot's shots missing their target TESTED

code/game/objects/structures/depot.dm

@@ -44,6 +44,7 @@
 /obj/structure/fusionreactor/proc/overload(var/containment_failure)
 	var/obj/effect/overload/O = new /obj/effect/overload(get_turf(src))
 	if(containment_failure)
+		playsound(loc, 'sound/machines/Alarm.ogg', 100, 0, 0)
 		O.deliberate = TRUE
 		O.max_cycles = 7
 	qdel(src)