Revert "Merge branch 'master' of https://github.com/PolarisSS13/Polaris into NanoGrade"

This reverts commit 6bb5409349, reversing
changes made to f6a83d5ee0.

code/datums/weakref.dm

@@ -1,31 +0,0 @@
-/datum
-	var/weakref
-
-/datum/Destroy()
-	weakref = null // Clear this reference to ensure it's kept for as brief duration as possible.
-	. = ..()
-
-//obtain a weak reference to a datum
-/proc/weakref(datum/D)
-	if(D.gcDestroyed)
-		return
-	if(!D.weakref)
-		D.weakref = new /datum/weakref(D)
-	return D.weakref
-
-/datum/weakref
-	var/ref
-
-/datum/weakref/New(datum/D)
-	ref = "\ref[D]"
-
-/datum/weakref/Destroy()
-	// A weakref datum should not be manually destroyed as it is a shared resource,
-	//  rather it should be automatically collected by the BYOND GC when all references are gone.
-	return 0
-
-/datum/weakref/proc/resolve()
-	var/datum/D = locate(ref)
-	if(D && D.weakref == src)
-		return D
-	return null