Converts A && A.B into A?.B (#54342)

Implements the ?. operator, replacing code like A && A.B with A?.B

BYOND Ref:
When reading A?.B, it's equivalent to A && A.B except that A is only evaluated once, even if it's a complex expression like a proc call.

code/game/objects/items/pinpointer.dm

@@ -133,7 +133,7 @@
 		var/crewmember_name = "Unknown"
 		if(H.wear_id)
 			var/obj/item/card/id/I = H.wear_id.GetID()
-			if(I && I.registered_name)
+			if(I?.registered_name)
 				crewmember_name = I.registered_name
 
 		while(crewmember_name in name_counts)