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/modular_computers/file_system/programs/airestorer.dm

@@ -20,7 +20,7 @@
 	if(computer)
 		ai_slot = computer.all_components[MC_AI]
 
-	if(computer && ai_slot && ai_slot.check_functionality())
+	if(computer && ai_slot?.check_functionality())
 		if(cardcheck == 1)
 			return ai_slot
 		if(ai_slot.enabled && ai_slot.stored_card)
@@ -49,7 +49,7 @@
 		if("PRG_eject")
 			if(computer.all_components[MC_AI])
 				var/obj/item/computer_hardware/ai_slot/ai_slot = computer.all_components[MC_AI]
-				if(ai_slot && ai_slot.stored_card)
+				if(ai_slot?.stored_card)
 					ai_slot.try_eject(usr)
 					return TRUE
 

code/modules/modular_computers/file_system/programs/card.dm

@@ -132,7 +132,7 @@
 			if(!authenticated)
 				return
 			var/contents = {"<h4>Access Report</h4>
-						<u>Prepared By:</u> [user_id_card && user_id_card.registered_name ? user_id_card.registered_name : "Unknown"]<br>
+						<u>Prepared By:</u> [user_id_card?.registered_name ? user_id_card.registered_name : "Unknown"]<br>
 						<u>For:</u> [target_id_card.registered_name ? target_id_card.registered_name : "Unregistered"]<br>
 						<hr>
 						<u>Assignment:</u> [target_id_card.assignment]<br>

code/modules/modular_computers/file_system/programs/cargoship.dm

@@ -20,7 +20,7 @@
 	data["has_id_slot"] = !!card_slot
 	data["has_printer"] = !!printer
 	data["paperamt"] = printer ? "[printer.stored_paper] / [printer.max_paper]" : null
-	data["card_owner"] = card_slot && card_slot.stored_card ? id_card.registered_name : "No Card Inserted."
+	data["card_owner"] = card_slot?.stored_card ? id_card.registered_name : "No Card Inserted."
 	data["current_user"] = payments_acc ? payments_acc.account_holder : null
 	data["barcode_split"] = percent_cut
 	return data

code/modules/modular_computers/file_system/programs/configurator.dm

@@ -35,11 +35,11 @@
 	data["disk_used"] = hard_drive.used_capacity
 	data["power_usage"] = movable.last_power_usage
 	data["battery_exists"] = battery_module ? 1 : 0
-	if(battery_module && battery_module.battery)
+	if(battery_module?.battery)
 		data["battery_rating"] = battery_module.battery.maxcharge
 		data["battery_percent"] = round(battery_module.battery.percent())
 
-	if(battery_module && battery_module.battery)
+	if(battery_module?.battery)
 		data["battery"] = list("max" = battery_module.battery.maxcharge, "charge" = round(battery_module.battery.charge))
 
 	var/list/all_entries[0]

code/modules/modular_computers/file_system/programs/ntdownloader.dm

@@ -185,7 +185,7 @@
 /datum/computer_file/program/ntnetdownload/proc/check_compatibility(datum/computer_file/program/P)
 	var/hardflag = computer.hardware_flag
 
-	if(P && P.is_supported_by_hardware(hardflag,0))
+	if(P?.is_supported_by_hardware(hardflag,0))
 		return "Compatible"
 	return "Incompatible!"
 

code/modules/modular_computers/file_system/programs/ntnrc_client.dm

@@ -184,7 +184,7 @@
 	var/list/all_channels = list()
 	for(var/C in SSnetworks.station_network.chat_channels)
 		var/datum/ntnet_conversation/conv = C
-		if(conv && conv.title)
+		if(conv?.title)
 			all_channels.Add(list(list(
 				"chan" = conv.title,
 				"id" = conv.id

code/modules/modular_computers/file_system/programs/powermonitor.dm

@@ -50,7 +50,7 @@
 		local_apc = null
 
 /datum/computer_file/program/power_monitor/proc/get_powernet() //keep in sync with /obj/machinery/computer/monitor's version
-	if(attached_wire || (local_apc && local_apc.terminal))
+	if(attached_wire || (local_apc?.terminal))
 		return attached_wire ? attached_wire.powernet : local_apc.terminal.powernet
 	return FALSE
 

code/modules/modular_computers/file_system/programs/radar.dm

@@ -230,7 +230,7 @@
 		var/crewmember_name = "Unknown"
 		if(humanoid.wear_id)
 			var/obj/item/card/id/ID = humanoid.wear_id.GetID()
-			if(ID && ID.registered_name)
+			if(ID?.registered_name)
 				crewmember_name = ID.registered_name
 		var/list/crewinfo = list(
 			ref = REF(humanoid),