Ports /tg's StonedMC Subsystem from Baystation12

* Partial port of @PsiOmegaDelta's https://github.com/Baystation12/Baystation12/pull/16820
* Only ports the StonedMC changes, not the garbage collector (forthcoming in future)

code/controllers/controller.dm

@@ -0,0 +1,19 @@
+/datum/controller
+	var/name
+	// The object used for the clickable stat() button.
+	var/obj/effect/statclick/statclick
+
+/datum/controller/proc/Initialize()
+
+//cleanup actions
+/datum/controller/proc/Shutdown()
+
+//when we enter dmm_suite.load_map
+/datum/controller/proc/StartLoadingMap()
+
+//when we exit dmm_suite.load_map
+/datum/controller/proc/StopLoadingMap()
+
+/datum/controller/proc/Recover()
+
+/datum/controller/proc/stat_entry()