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/modules/admin/admin_verbs.dm

@@ -646,7 +646,7 @@ GLOBAL_PROTECT(admin_verbs_hideable)
 	set name = "Remove Spell"
 	set desc = "Remove a spell from the selected mob."
 
-	if(T && T.mind)
+	if(T?.mind)
 		var/obj/effect/proc_holder/spell/S = input("Choose the spell to remove", "NO ABRAKADABRA") as null|anything in sortList(T.mind.spell_list)
 		if(S)
 			T.mind.RemoveSpell(S)