refactor buckling to be more generic

Buckling procs and vars have been moved down to /obj.
Behaviour is mostly the same, but you can buckle cuffed people to
 pipes and they will automatically unbuckle if the cuffs are removed.

Signed-off-by: Mloc-Argent <colmohici@gmail.com>

code/game/objects/items/weapons/implants/implantfreedom.dm

@@ -23,6 +23,8 @@
 			if (source.handcuffed)
 				var/obj/item/weapon/W = source.handcuffed
 				source.handcuffed = null
+				if(source.buckled && source.buckled.buckle_require_restraints)
+					source.buckled.unbuckle_mob()
 				source.update_inv_handcuffed()
 				if (source.client)
 					source.client.screen -= W

code/game/objects/items/weapons/scrolls.dm

@@ -70,7 +70,7 @@
 		return
 
 	if(user && user.buckled)
-		user.buckled.unbuckle()
+		user.buckled.unbuckle_mob()
 
 	var/list/tempL = L
 	var/attempt = null

code/game/objects/items/weapons/tools.dm

@@ -119,6 +119,8 @@
 		"You cut \the [C]'s restraints with \the [src]!",\
 		"You hear cable being cut.")
 		C.handcuffed = null
+		if(C.buckled && C.buckled.buckle_require_restraints)
+			C.buckled.unbuckle_mob()
 		C.update_inv_handcuffed()
 		return
 	else
@@ -531,4 +533,4 @@
 	if(!resolved && tool && target)
 		tool.afterattack(target,user,1)
 	if(tool)
-		tool.loc = src*/
+		tool.loc = src*/