Unify datum definitions (#3991)

Unifies all datum vars into a single file & moves all datum procs that made sense into that same file.

aurorastation.dme

@@ -211,6 +211,7 @@
 #include "code\datums\category.dm"
 #include "code\datums\computerfiles.dm"
 #include "code\datums\datacore.dm"
+#include "code\datums\datum.dm"
 #include "code\datums\discord_bot.dm"
 #include "code\datums\disease.dm"
 #include "code\datums\feedback.dm"

code/controllers/subsystems/garbage.dm

@@ -231,27 +231,6 @@ var/datum/controller/subsystem/garbage_collector/SSgarbage
 	else if(D.gcDestroyed == GC_CURRENTLY_BEING_QDELETED)
 		CRASH("[D.type] destroy proc was called multiple times, likely due to a qdel loop in the Destroy logic")
 
-// Default implementation of clean-up code.
-// This should be overridden to remove all references pointing to the object being destroyed.
-// Return the appropriate QDEL_HINT; in most cases this is QDEL_HINT_QUEUE.
-/datum/proc/Destroy(force=FALSE)
-	weakref = null
-	destroyed_event.raise_event(src)
-	SSnanoui.close_uis(src)
-	tag = null
-	var/list/timers = active_timers
-	active_timers = null
-	if (timers)
-		for (var/thing in timers)
-			var/datum/timedevent/timer = thing
-			if (timer.spent)
-				continue
-			qdel(timer)
-
-	return QDEL_HINT_QUEUE
-
-/datum/var/gcDestroyed //Time when this object was destroyed.
-
 /client/Destroy()
 	..()
 	return QDEL_HINT_HARDDEL_NOW

code/controllers/subsystems/processing/processing.dm

@@ -36,7 +36,3 @@ var/datum/controller/subsystem/processing/SSprocessing
 // Helper so PROCESS_KILL works.
 /datum/controller/subsystem/processing/proc/stop_processing(datum/D)
 	STOP_PROCESSING(src, D)
-
-/datum/var/isprocessing = 0
-/datum/proc/process()
-	return PROCESS_KILL

code/controllers/subsystems/timer.dm

@@ -220,7 +220,6 @@ var/datum/controller/subsystem/timer/SStimer
 	timer_id_dict |= SStimer.timer_id_dict
 	bucket_list |= SStimer.bucket_list
 
-/datum/var/list/active_timers
 /datum/timedevent
 	var/id
 	var/datum/callback/callBack

code/datums/datum.dm

@@ -0,0 +1,27 @@
+/datum
+	var/tmp/list/active_timers
+	var/tmp/datum/weakref/weakref
+	var/tmp/isprocessing = 0
+	var/tmp/gcDestroyed //Time when this object was destroyed.
+
+// Default implementation of clean-up code.
+// This should be overridden to remove all references pointing to the object being destroyed.
+// Return the appropriate QDEL_HINT; in most cases this is QDEL_HINT_QUEUE.
+/datum/proc/Destroy(force=FALSE)
+	weakref = null
+	destroyed_event.raise_event(src)
+	SSnanoui.close_uis(src)
+	tag = null
+	var/list/timers = active_timers
+	active_timers = null
+	if (timers)
+		for (var/thing in timers)
+			var/datum/timedevent/timer = thing
+			if (timer.spent)
+				continue
+			qdel(timer)
+
+	return QDEL_HINT_QUEUE
+
+/datum/proc/process()
+	return PROCESS_KILL

code/datums/weakref.dm

@@ -1,10 +1,6 @@
-/datum
-	var/datum/weakref/weakref
-
 /datum/weakref
 	var/ref
 
-
 /datum/weakref/New(datum/D)
 	ref = SOFTREF(D)