Both enabled and disabled preferences are now stored.

The purpose is to ensure that new preferences that are in neither list get the appropriate enabled/disabled setting without having to utilize the savefile update path.

Also attempts to optimize the acquirement of the preference mob.

code/modules/client/preferences.dm

@@ -109,6 +109,7 @@ datum/preferences
 	// OOC Metadata:
 	var/metadata = ""
 
+	var/client/client = null
 	var/client_ckey = null
 
 	// Communicator identity data
@@ -125,6 +126,7 @@ datum/preferences
 	gear = list()
 
 	if(istype(C))
+		client = C
 		client_ckey = C.ckey
 		if(!IsGuestKey(C.key))
 			load_path(C.ckey)