Seal/abstract/virtual everything (#6739)

Content.Shared/Configurable/SharedConfigurationComponent.cs

@@ -5,10 +5,11 @@ using Robust.Shared.Serialization;
 
 namespace Content.Shared.Configurable
 {
+    [Virtual]
     public class SharedConfigurationComponent : Component
     {
         [Serializable, NetSerializable]
-        public class ConfigurationBoundUserInterfaceState : BoundUserInterfaceState
+        public sealed class ConfigurationBoundUserInterfaceState : BoundUserInterfaceState
         {
             public Dictionary<string, string> Config { get; }
 
@@ -22,7 +23,7 @@ namespace Content.Shared.Configurable
         ///     Message data sent from client to server when the device configuration is updated.
         /// </summary>
         [Serializable, NetSerializable]
-        public class ConfigurationUpdatedMessage : BoundUserInterfaceMessage
+        public sealed class ConfigurationUpdatedMessage : BoundUserInterfaceMessage
         {
             public Dictionary<string, string> Config { get; }
 
@@ -33,7 +34,7 @@ namespace Content.Shared.Configurable
         }
 
         [Serializable, NetSerializable]
-        public class ValidationUpdateMessage : BoundUserInterfaceMessage
+        public sealed class ValidationUpdateMessage : BoundUserInterfaceMessage
         {
             public string ValidationString { get; }