Updates subsystem definitions to new standards. (#17470)

* My heart is dragging me down into...

...oblivion!

* drifting closer to the edge but she won't have me

* ever round me we are dead before we meet her

* for the last time

* wake up in sweat

* n

* fff

* uff

---------

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

code/controllers/subsystems/virtual_reality.dm

@@ -1,6 +1,4 @@
-/var/global/datum/controller/subsystem/virtualreality/SSvirtualreality
-
-/datum/controller/subsystem/virtualreality
+SUBSYSTEM_DEF(virtualreality)
 	name = "Virtual Reality"
 	init_order = SS_INIT_MISC_FIRST
 	flags = SS_NO_FIRE
@@ -17,9 +15,6 @@
 	var/list/boundnetworks = list(REMOTE_AI_ROBOT)
 	var/list/list/bounded = list()
 
-/datum/controller/subsystem/virtualreality/New()
-	NEW_SS_GLOBAL(SSvirtualreality)
-
 /datum/controller/subsystem/virtualreality/Initialize()
 	for(var/network in mechnetworks)
 		mechs[network] = list()