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/mining/lavaland/ash_flora.dm

@@ -349,7 +349,7 @@
 
 /obj/item/reagent_containers/glass/bowl/mushroom_bowl/update_overlays()
 	. = ..()
-	if(reagents && reagents.total_volume)
+	if(reagents?.total_volume)
 		var/mutable_appearance/filling = mutable_appearance('icons/obj/lavaland/ash_flora.dmi', "fullbowl")
 		filling.color = mix_color_from_reagents(reagents.reagent_list)
 		. += filling

code/modules/mining/machine_redemption.dm

@@ -52,7 +52,7 @@
 	if(O.refined_type == null)
 		return
 
-	if(O && O.refined_type)
+	if(O?.refined_type)
 		points += O.points * point_upgrade * O.amount
 
 	var/material_amount = mat_container.get_item_material_amount(O, BREAKDOWN_FLAGS_ORM)

code/modules/mining/minebot.dm

@@ -83,7 +83,7 @@
 			. += "<span class='boldwarning'>[t_He] look[t_s] severely dented!</span>"
 	. += {"<span class='notice'>Using a mining scanner on [t_him] will instruct [t_him] to drop stored ore. <b>[max(0, LAZYLEN(contents) - 1)] Stored Ore</b>\n
 	Field repairs can be done with a welder."}
-	if(stored_gun && stored_gun.max_mod_capacity)
+	if(stored_gun?.max_mod_capacity)
 		. += "<b>[stored_gun.get_remaining_mod_capacity()]%</b> mod capacity remaining."
 		for(var/A in stored_gun.get_modkits())
 			var/obj/item/borg/upgrade/modkit/M = A