Telecrystals (and a bit more ECS) (#4775)

Content.Shared/Traitor/Uplink/UplinkAccount.cs

@@ -1,32 +1,16 @@
 using Robust.Shared.GameObjects;
-using Robust.Shared.ViewVariables;
-using System;
 
 namespace Content.Shared.Traitor.Uplink
 {
     public class UplinkAccount
     {
-        public event Action<UplinkAccount>? BalanceChanged;
-        public EntityUid AccountHolder;
-        private int _balance;
-        [ViewVariables]
-        public int Balance => _balance;
+        public readonly EntityUid? AccountHolder;
+        public int Balance;
 
-        public UplinkAccount(EntityUid uid, int startingBalance)
+        public UplinkAccount(int startingBalance, EntityUid? accountHolder = null)
         {
-            AccountHolder = uid;
-            _balance = startingBalance;
-        }
-
-        public bool ModifyAccountBalance(int newBalance)
-        {
-            if (newBalance < 0)
-            {
-                return false;
-            }
-            _balance = newBalance;
-            BalanceChanged?.Invoke(this);
-            return true;
+            AccountHolder = accountHolder;
+            Balance = startingBalance;
         }
     }
 }

Content.Shared/Traitor/Uplink/UplinkListingData.cs

@@ -8,11 +8,11 @@ namespace Content.Shared.Traitor.Uplink
     [Serializable, NetSerializable]
     public class UplinkListingData : ComponentState, IEquatable<UplinkListingData>
     {
-        public string ItemId;
-        public int Price;
-        public UplinkCategory Category;
-        public string Description;
-        public string ListingName;
+        public readonly string ItemId;
+        public readonly int Price;
+        public readonly UplinkCategory Category;
+        public readonly string Description;
+        public readonly string ListingName;
 
         public UplinkListingData(string listingName, string itemId,
             int price, UplinkCategory category,